Satellite Oceanography and Meteorology

Satellite Oceanography and Meteorology

Basic info

  • Publisher: whioce
  • Country of publisher: singapore
  • Date added to EuroPub: 2020/Feb/27

Subject and more

  • LCC Subject Category: Environmental Sciences, Oceanography, Meteorology, Climate Change
  • Publisher's keywords: Satellite, Oceanography, Meteorology, Climate Change
  • Language of fulltext: amharic, english
  • Time from submission to publication: weeks

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  • Article Processing Charges (APCs): No
  • Submission charges: No
  • Waiver policy for charges? No

Open access & licensing

  • Type of License:
  • License terms
  • Open Access Statement: No
  • Year open access content began: 2016
  • Does the author retain unrestricted copyright? False
  • Does the author retain publishing rights? False

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This journal has '31' articles

Remote sensing application in monitoring change of river and coastlines of Morong, Bataan, Philippines

Remote sensing application in monitoring change of river and coastlines of Morong, Bataan, Philippines

Authors: Annie Melinda Paz-Alberto, Edmark P. Bulaong, Jose T. Gavino, Christopher R. Genaro, Ranilo B. Lao
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Abstract

Remote sensing offers fast, cheap and reliable method in detecting river and coastal changes. In this study, satellite imageries of Morong river and coastlines from 2006 to 2016 were collected and analyzed to monitor changes. Field measurements were also done using South Total Station (NTS-362R6L) in 2016 for comparison and validation of data. Results showed that the river outlet and the riverbank increased in width size due to erosion brought about by torrential rains and urban run-offs. Coastlines near the river narrowed in size or shifted landward due to coastal erosion and sea level rise. An interview was conducted to locals residing nearby the river and coast where strong typhoons were reported which cause geophysical changes in the area. The residents also observed sea level rise, coastal and river erosion which caused narrowing of the coastlines and widening of the river, respectively. Records of high tides and low tides collected were projected in annual average levels per month. The average level of low tides increased per year which can be a result of sea level rise. The computed RMSE between field and remote sensing measurements ranged from 0.1m to 0.67m which indicated positional accuracy of Google Earth in the area.

Keywords: Remote Sensing; River Outlets; Riverbank; Coastlines; Urban Runoff
Coupled data assimilation in climate research: A brief review of applications in ocean and land

Coupled data assimilation in climate research: A brief review of applications in ocean and land

Authors: Kazuyoshi Suzuki, Milija Zupanski
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Abstract

Regions of the cryosphere, including the poles, that are currently unmonitored are expanding, therefore increasing the importance of satellite observations for such regions. With the increasing availability of satellite data in recent years, data assimilation research that combines forecasting models with observational data has begun to flourish. Coupled land/ice-atmosphere/ocean models generally improve the forecasting ability of models. Data assimilation plays an important role in such coupled models, by providing initial conditions and/or empirical parameter estimation. Coupled data assimilation can generally be divided into three types: uncoupled, weakly coupled, or strongly coupled. This review provides an overview of coupled data assimilation, introduces examples of its use in research on sea ice-ocean interactions and the land, and discusses its future outlook. Assimilation of coupled data constitutes an effective method for monitoring cold regions for which observational data are scarce and should prove useful for climate change research and the design of efficient monitoring networks in the future.

Keywords: coupled atmosphere-ocean/land; uncoupled data assimilation; weakly coupled data assimilation; strongly coupled data assimilation; error covariance
Anomalous wind circulation over Taipei, Taiwan during the northern winter seasons of 2004 and 2005- A case study

Anomalous wind circulation over Taipei, Taiwan during the northern winter seasons of 2004 and 2005- A case study

Authors: A. Narendra Babu, V. Naveen Kumar, P. S. Brahmanandam, M. Purnachandra Rao, M. Roja Raman, K. Sreedhar
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Abstract

This research reports, for the first time, an anomalous wind circulation over Taipei (Latitude 25.030N, Longitude 121.510E), Taiwan during the northern hemisphere winter season (December, January, and February) of years 2004 and 2005. The anomalous wind circulation of meridional winds, which showed southward directions during the winter seasons of 2004 and 2005 instead of northward winds, is noticed from one kilometer altitude range (lower troposphere) and that trend continued till around 20 km altitude range (lower stratosphere). To ascertain whether such a disturbed nature of wind pattern existed over nearby locations to Taipei, we have analyzed radiosonde-measured meridional and zonal winds over four nearby stations station to Taipei including, Roig, Xiamen, Minami and Fuzhou. Surprisingly, no anomalous wind behavior is seen except over Taipei during the northern winter seasons of 2004 and 2005. On the other hand, the European Centre for Medium-Range Weather Forecasts (ECMWF) model-predicted winds do not show any anomalous wind patterns over Taipei and other nearby stations, possibly due to the large averaging of internal variabilities of reanalysis databases. The plausible physical mechanisms of these disturbed meridional wind patterns are not understood at this juncture, but it is believed that local winds and atmospheric pollutants might havecreated an amicable environment as to provide such a disturbed meridional wind pattern over Taipei, Taiwan in the winter season of 2004 and 2005.

Keywords: Radiosonde-measured winds; ECMWF- re-analysis winds; Evaporation minus Precipitation; Atmospheric pollutants.
Geophysical changes detection by remote sensing in Alaminos River Pangasinan, Philippines

Geophysical changes detection by remote sensing in Alaminos River Pangasinan, Philippines

Authors: Annie Melinda Paz-Alberto, Edmark P. Bulaong, Ranilo B. Lao, Eleazar V. Raneses, Bennidict P. Pueyo
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Abstract

Geophysical changes of the river outlets, riverbanks and coastlines in Alaminos, Pangasinan were measured using Google Earth from 2009 to 2014. On the other hand, actual measurements were gathered using South Total Station (NTS-362R6L) in 2015. The insights of the residents regarding feature changes of the river were obtained through one on one interview. Root Mean Square Errors (RMSE) were computed for measurement and horizontal positional accuracy of Google Earth. To perceive the effects of sea levels, historical data (2004-2015) from Bolinao, Philippines Tide Chart at online tides and currents predictions were also analyzed. Alaminos river outlets decreased in width size due to natural factor and human activities. Alaminos riverbank increased in width size which could be possibly due to natural calamities and weak bank resistance brought about by the frequent flooding caused by heavy rains and the emergency released of water from San Roque Dam. Generally the north and south coasts of Alaminos River increased and expanded. Rise in sea level is also a probable cause of changes wherein heights of low tides in Pangasinan Gulf is increasing overtime. The computed RMSE was low which indicate positional accuracy and measurement of Google Earth in the study area.

Keywords: Remote Sensing; Accretion; Erosion; Fish pens/cages
Satellite-based study of physico-optical properties of aerosols over a westernmost location of Brahmaputra valley

Satellite-based study of physico-optical properties of aerosols over a westernmost location of Brahmaputra valley

Authors: Jhuma Biswas
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Abstract

This study examines the long term trend of the radiatively active atmospheric aerosols which can influence the Earth’s energy budget directly by scattering and absorbing radiation and indirectly by acting as cloud condensation nuclei. MODIS sensor on board the NASA Earth Observing System Terra and Aqua satellite based Aerosol Optical Depth (AOD) data are used for long term analysis of aerosols over Bongaigaon, Assam for the period August, 2002 to March, 2017. Highest AOD values are observed in pre-monsoon (March-May) season due to long range transportation as well as intense biomass burning activities especially as a part of Jhum cultivation. In general, AOD values are low in post-monsoon (October-November) season which may be due to wash out of aerosols by rain in the preceding months without enough replacement. The monthly AOD values vary from its highest value 0.949 in April, 2016 to its lowest value 0.107 in November, 2002 for the study period. From the comparison of MODIS Terra and Aqua AOD at 550 nm, it is clearly seen that generally Terra AOD at 10:30 hr is higher than the Aqua AOD at 13:30hr. A slowly increasing trend of both Aqua and Terra AOD at 550 nm is observed over the study location. The observed Ångström exponent value varies from its minimum value in monsoon season to its maximum value in winter season. With increasing AOD values, horizontal visibility decreases over Bongaigaon.

Keywords: AOD; MODIS; TRMM; Jhum Cultivation; Visibility
Reflection-coefficient experimental extraction from S21- parameter for radar oil-spill detection application

Reflection-coefficient experimental extraction from S21- parameter for radar oil-spill detection application

Authors: Bilal Hammoud, Fabien Ndagijimana, Ghaleb Faour, Hussam Ayad, Majida Fadlallah, Jalal Jomaah
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Abstract

Oil spill in sea water is one of the main accidents that affect significantly the maritime environment over a long period of time. Knowing the severe influence of oil spills on the ecosystem, it is crucial to have oil spill detecting and monitoring systems for quick intervention and danger containment. In our project, we propose the usage of drones as an oil spill detection system. The drones will be implementing different previously developed multi-frequency approaches for the detection. The effectiveness of such techniques is based on the accuracy of the data collected and their match to the theory. This journal presents a method for the remote extraction of reflection coefficients from multilayer structure modeling an oil spill in sea water. The experimental results for the reflectivity extraction validate the theoretical calculations and allow the implementation of different algorithms based on the statistical information taken directly from the site.

Keywords: Oil spill; radar; reflection coefficient; reflectivity; dielectric constant; parameter extraction
Test and evaluation of a simple parameterization to enhance air-sea coupling in a global coupled model

Test and evaluation of a simple parameterization to enhance air-sea coupling in a global coupled model

Authors: Fanghua Xu
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Abstract

A simple temperature-dependent wind stress scheme is implemented in National Center for Atmospheric Research (NCAR) Community Earth System Model (CESM), aiming to enhance positive wind stress and sea surface temperature (SST) correlation in SST-frontal regions. A series of three-year coupled experiments are conducted to determine a proper coupling coefficient for the scheme based on the agreement of surface wind stress and SST at oceanic mesoscale between model simulations and observations. Afterwards, 80-year simulations with/without the scheme are conducted to explore its effects on simulated ocean states and variability. The results show that the new scheme indeed improves the positive correlation between SST and wind stress magnitude near the large oceanic fronts. With more realistic surface heat flux and wind stress, the global SST biases are reduced. The global ocean circulation represented by barotropic stream function exhibits a weakened gyre circulation close to the western boundary separation, in agreement with previous studies. The simulation of equatorial Pacific current system is improved as well. The overestimated El Niño Southern Oscillation (ENSO) magnitude in original CESM is reduced by ~30% after using the new scheme with an improved period.

Keywords: SST front; Air-sea interaction; Wind stress; CESM
Co-occurrence of extreme ozone and heat waves in two cities from Morocco

Co-occurrence of extreme ozone and heat waves in two cities from Morocco

Authors: Kenza KHOMSI, Houda NAJMI, Zineb SOUHAILI
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Abstract

Temperature is the first meteorological factor to be directly involved in leading ozone (O3) extreme events. Generally, upward temperatures increase the probability of having exceedance in ozone adopted thresholds. In the global climate change context more frequent and/or persistent heat waves and extreme ozone (O3) episodes are likely to occur during in coming decades and a key question is about the coincidence and co-occurrence of these extremes. In this paper, using 7 years of surface temperature and air quality observations over two cities from Morocco (Casablanca and Marrakech) and implementing a percentile thresholding approach, we show that the extremes in temperature and ozone (O3) cluster together in many cases and that the outbreak of ozone events generally match the first or second days of heat waves. This co-occurrence of extreme episodes is highly impacted by humidity and may be overlapping large-scale episodes.

Keywords: Heat Wave; Extreme Ozone (O3) Event; Percentiles; Co-occurrence; Morocco
An attitude determination method based on convected Euler angle error model for SINS/CNS integrated system

An attitude determination method based on convected Euler angle error model for SINS/CNS integrated system

Authors: Jianli Li, Yun Wang, Pengfei Dang, Zhaoxing Lu
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Abstract

The attitude determination method plays an important role in SINS/CNS integrated system for spacecraft. Since the misalignment angels are indirect measurements, the misalignment angle model used in the existing attitude determination method can cause transformation errors. To solve the problem, an attitude determination method based on convected Euler angle error model for SINS/CNS integrated system is proposed. The attitude error propagation is analyzed, and the convected Euler angle error model is derived. Furthermore, the state equation of SINS/CNS integrated system is established. The Kalman filter estimates and compensates the Euler angle errors. Finally, simulation results verified that the proposed method can improve the attitude accuracy compared to the conventional misalignment angle method.

Keywords: Attitude determination method; SINS/CNS integrated system; Misalignment angels; Transformation errors; Convected Euler angle errors
Climate of early Martian surface and loss of water – A review

Climate of early Martian surface and loss of water – A review

Authors: M. Chinnamuthu, S. Anbazhagan, K. Tamilarasan
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Abstract

Mars is one of the interesting planets for geoscientists to explore the presence of water on the surface of terrestrial planets. The age, geology and geomorphic processes of Mars are almost similar to Earth surface processes. However, earth has tremendous influence of tectonism. The Martian surface once it was flourishing with water flow and formations of fluvial channels, lakes, deltas and oceans. The planet Mars evolved through ages with different climatic conditions from warm wetter period to cold drier period. In the present paper, different climatic condition and the reasons for escape of water from surface of Mars are discussed.

Keywords: Climate Change; Loss of Water; Mars
Seagrass distribution changes in Swan Lake of Shandong Peninsula from 1979 to 2009 inferred from satellite remote sensing data

Seagrass distribution changes in Swan Lake of Shandong Peninsula from 1979 to 2009 inferred from satellite remote sensing data

Authors: Dingtian Yang, Xiaoqing Yin, Lizhu Zhou
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Abstract

Seagrass and associated bio-resources are very important for swan’s overwintering in Swan Lake in Rongcheng of Shandong Peninsula of China. The seagrass distribution changes, which are usually affected by the regional human activities, can indirectly affect swan’s habitat. In this study the satellite remote sensing data in years 1979–2009 together with in-situ observations in recent years were used to examine the seagrass distribution changes in Swan Lake. The band ratio of band 1 to band 2, Lyzenga’s methods and band synthesize of band 1, band 2 and band 3 were used for seagrass retrieval. The band ratio of band 1 to band 2 with ranges greater than 4.5 was used for estimating the seagrass coverage greater than 50%. Results showed that in years 1979–1990 seagrass coverage greater than 50% occupied more than half of the surface area of Swan Lake. In years 2000–2005, the total area with seagrass distributions reduced greatly, only about one sixth to one fourth of Swan Lake’s surface area. After 2005, the seagrass area in Swan Lake increased gradually and occasionally was greater than one third of the total surface area of the Lake. It was shown that human activities such as the dam and fish pond establishment and the awareness of seagrass importance and protected actively result in the seagrass distributions changes in Swan Lake which decreased first and then increased afterwards.

Keywords: seagrass; distribution change; satellite remote sensing; Swan Lake
Global positioning system application for monitoring of the engineering infrastructure facility safety

Global positioning system application for monitoring of the engineering infrastructure facility safety

Authors: SEVIL N. Tabasaranskaya, BAHAR N. Aliyeva, NAMIG Rahimov, RUSTAM B. Rustamov
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Abstract

Oil and gas companies need to ensure continuous operation of critical equipment, no matter how remote. This means knowing exactly where your fleets and equipment are, how they are performing and identifying problems as they occur. There are number of existing security systems developed to protect linear systems like oil pipelines for transportation of oil and gas products from the first point of development up to collection stations. In the current stage is the gap of the oil and gas pipeline systems security purposes of use of space technology advances. This paper dedicated to the subject of linear pipeline monitoring with use of global positioning system for observation of changes of land in the areas actively functioning of natural disaster factor.

Keywords: Global Positioning System; Natural Disasters; Monitoring, Linear System; Engineering Facility Safety
Space-based Earth remote sensing: Part 1. Satellite orbit theory

Space-based Earth remote sensing: Part 1. Satellite orbit theory

Authors: Sung Wook Paek, Sangtae Kim
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Abstract

The development of oceanography and meteorology has greatly benefited from remotely sensed satellite data of the atmosphere and ocean. For oceanographers, meteorologists, hydrologists and climatologists to obtain high-quality satellite data, orbits along which the satellites move must be designed carefully. For this reason, Sun-synchronous, repeat ground track orbits have traditionally been used for visible-wavelength and infrared Earth observations. As the needs for varied datasets are growing, however, new classes of Earth-observing missions are emerging such as interferometry and radiometry to name a few. On the other side, satellite platforms and onboard sensors are getting more compact and less expensive, allowing developing nations to launch their own satellites and under-researched parts of the Earth be studied. In light of these changes, this paper introduces new types of satellite orbits from celestial mechanics perspectives, whose applications will be detailed further in the follow-up work.

Keywords: satellite orbit; Sun-synchronous orbit; repeat ground track; quasi-synchronization; tide
Impacts of model resolution on simulation of mesoscale eddies in the Northeast Pacific Ocean

Impacts of model resolution on simulation of mesoscale eddies in the Northeast Pacific Ocean

Authors: Youyu Lu, Jiaxing Li, Ji Lei and Charles Hannah
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Abstract

The model simulated meso-scale eddies in the Northeast Pacific Ocean, using two models with nominal horizontal resolutions of 1/12° and 1/36° in latitude/longitude (grid spacing of 7.5 km and 2.5 km), respectively, are presented. Compared with the 1/12° model, the 1/36° model obtains (1) similar variance and wave number spectra of the sea level anomaly and water temperature anomaly, and (2) increases in the level of the domain-averaged total kinetic energy, eddy kinetic energy (EKE), and variance of horizontal gradient of water temperature. In the interior basin of the southern region, both models show stronger eddy frontal activities, represented by EKE, temperature and its horizontal gradient, in summer and fall than in winter and spring. The challenge of evaluating the realism of high-resolution ocean models with conventional satellite remote sensing observations is discussed.

Keywords: meso-scale eddies; Northeast Pacific Ocean; ocean modelling
The annual cycle of surface eddy kinetic energy and its influence on eddy momentum fluxes as inferred from altimeter data

The annual cycle of surface eddy kinetic energy and its influence on eddy momentum fluxes as inferred from altimeter data

Authors: Xiaoming Zhai
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Abstract

The annual cycle of surface eddy kinetic energy (EKE) and its influence on eddy momentum fluxes are investigated using an updated record of satellite altimeter data. It is found that there is a phase difference between the annual cycles of EKE in the western boundary current regions and EKE in the interior of the subtropical gyres, suggesting that different mechanisms may be at work in different parts of the subtropical gyres. The annual cycles of EKE averaged in the two hemispheres are found to be of similar magnitude but in opposite phase. As a result, the globally-averaged EKE shows little seasonal variability. The longer record of altimeter data used in this study has brought out a clearer and simpler picture of eddy momentum fluxes in the Gulf Stream and Kuroshio Extensions: eddies in both regions systematically flux westerly momentum into the western boundary current jets. Considerable seasonal variations in eddy momentum fluxes are found in the western boundary current regions, which potentially play an important role in modulating the strength of the western boundary currents and their associated recirculation gyres on the seasonal time scale.

Keywords: Eddy kinetic energy; eddy momentum flux; seasonal cycle; western boundary current; altimeter

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