Chlorophyll-a, SST and particulate organic carbon in response to the cyclone Amphan in the Bay of Bengal

Golder, Md Rony; Shuva, Md Shahin Hossain; Rouf, Muhammad Abdur; Uddin, Mir Muhammad Nasir; Bristy, Sayeda Kamrunnahar; Bir, Joyanta

doi:10.1007/s12040-021-01668-1

Cited by 9 publications

(6 citation statements)

References 35 publications

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“…This highlights the dynamic and complex nature of eddy formation in the BoB, driven by different physical processes in the western and eastern regions [17,48]. The studies by Chen et al [17], Chang et al and Jinglong et al [48,53] highlighted the significance of baroclinic instability and wind stress in affecting the variability of eddies in the BOB. Analysis of histogram on the lifespan of mesoscale eddies revealed a relative dominance of short-lived eddies (both cyclonic eddies, represented by blue bars, and anticyclonic eddies, represented by red bars, as shown in Figure 5) across all years of observation (top left plot).…”

Section: Mesoscale Eddy Life Span Frequency and Track Analysismentioning

confidence: 88%

Mesoscale Eddies and their Impact on Primary Productivity in the Bay of Bengal

Ahmad,

Jose,

Dash

et al. 2024

Preprint

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Mesoscale eddies wield a significant influence on primary productivity in marine ecosystems by regulating nutrient availability, vertical mixing, and phytoplankton growth dynamics. In this study, we tracked and analyzed the effects of mesoscale eddies on net primary productivity (NPP) across the Bay of Bengal (BoB) using remote sensing data. Dividing the Bay into six zones based on mesoscale eddy frequency and distribution, our analysis identified 1880 anticyclonic eddies and 1972 cyclonic eddies during January 2010–March 2020 monitoring period. Cyclonic eddies predominantly occurred in the western part of the bay - along the east coast of the Indian Peninsula; while anticyclonic eddies were also observed, albeit in lesser proportions. Among eddies lasting one-week, anticyclonic eddies comprised approximately 48.81%, while cyclonic eddies constituted approximately 51.19% of the total. Analysis of the NPP distribution across the months revealed intriguing patterns. Mean values of NPP fluctuated throughout the year, with the highest value observed in August (748.51 mg C/m2/day) and the lowest in May (519.26 mg C/m2/day). The findings indicate a complex relationship between eddy distribution and NPP, with Zones 1 and 2 exhibiting a higher occurrence of cyclonic eddies, correlating with greater NPP and its variability. Conversely, Zones 3 and 5 display increased eddy activity despite fewer cyclonic eddies and lower NPP levels. Zone 6 shows reduced eddy activity and NPP, while Zone 4 presents moderate eddy activity alongside lower NPP. In contrast, Zones 3 to 5 exhibit lower NPP levels despite exhibiting heightened eddy activity. This study contributes valuable insights into the dynamics of ocean circulation and the impacts of eddies on NPP, which can inform fisheries management strategies, advances climate resilience measures, expands scientific knowledge, and guides policies related to conservation and sustainable resource utilization.

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Section: Mesoscale Eddy Life Span Frequency and Track Analysismentioning

confidence: 88%

Mesoscale Eddies and their Impact on Primary Productivity in the Bay of Bengal

Ahmad,

Jose,

Dash

et al. 2024

Preprint

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“…The upwelling-driven average temperature difference led to a significant warming effect, with cold bottom water reaching the sea surface and causing a temperature rise of up to 0.20 • C and a maximum temperature drop of 1.01 • C at coordinates 12.5 • N and 112.3 • E on the 19th day of the observation period. The influencing factors affecting sea surface temperature during typhoons involve complex physicochemical processes such as air-sea heat exchange, precipitation mechanisms, and seawater mixing dynamics; among these factors, seawater mixing predominantly governs both sea-air heat exchange and upwelling phenomena [11,20]. According to the temperature variations resulting from the interaction between upwelling and seawater, the mixing of cold water uplift and seawater exchange due to upwelling accounted for 50% of the total change in sea surface temperature (SST), whereas approximately half of the overall contribution was attributed to a decrease in SST caused by air-sea heat exchange and other physical processes.…”

Section: Analysis Of Response Characteristics Of Sea Surface Temperaturementioning

confidence: 99%

“…In winter, under the influence of the strong wind speed of the northeast monsoon, the chlorophyll concentration in the Beibu Gulf increases, and during a typhoon, the chlorophyll concentration also shows an abnormal increase. The response of chlorophyll concentration to typhoons is delayed, usually by 2-5 days [11,12].…”

Section: Introductionmentioning

confidence: 99%

The Investigation of the Response Mechanism of SST and Chlorophyll to Super Typhoon “Rey” in the South China Sea

Wang,

Song,

Guo

et al. 2024

Water

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As one of the most significant disturbance sources in the upper marine environment of the South China Sea, tropical cyclones (typhoons) serve as a typical research subject for investigating the energy transfer process between the ocean and atmosphere. Utilizing satellite remote sensing data and focusing on Typhoon Rey No. 22’s transit event in 2021, this study quantitatively analyzes typhoon-induced energy input through heat pumping and cold suction at both surface and subsurface levels of the ocean. Additionally, it explores the response characteristics and feedback mechanisms of sea surface temperature (SST) and chlorophyll-a concentration (Chl-a) in the South China Sea to typhoon events. The research results show that the SST variation along the typhoon track displayed an asymmetric pattern, with a more pronounced warming on the right side and a cold anomaly lasting for 3–5 days on the left side. The subsurface warm anomaly dominated on the right side, showing a maximum temperature difference of 1.54 °C, whereas Ekman suction-induced upwelling led to cooling effects both at the subsurface and surface level on the left side, resulting in a maximum temperature difference of −3.28 °C. During the typhoon event, there was a significant decrease in sea surface heat flux, reaching 323.36 W/m2, accompanied by corresponding changes in SST due to processes such as upwelling, seawater mixing, and air–sea heat transfer dynamics where anomalies arising from oceanic dynamic processes and exchange through sea surface heat flux contributed equally. Furthermore, strong suction-induced upwelling during the typhoon influenced chlorophyll concentration within the central and western regions of the South China Sea (13.5° N–16.5° N, 111° E–112.5° E), resulting in significant enhancement and reaching its peak value at approximately 0.65 mg/L. The average chlorophyll concentration increased by approximately 0.31 mg/L.

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“…Remotely sensed environmental observations from the MODIS instrument, including SST and Chlo-a, have been validated profusely by the scientific community against a number of models and in situ measurements [51][52][53][54][55][56][57][58] and used in a diverse set of studies 13,14,19,[59][60][61][62][63][64][65][66][67] . For instance, validation of the SST observation uses accurate ship-based infrared radiometers and differing and moored buoys with thermometers a meter of depth 38,56,57 .…”

Section: Technical Validationmentioning

confidence: 99%

A database of global coastal conditions

et al. 2021

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Remote sensing satellite imagery has the potential to monitor and understand dynamic environmental phenomena by retrieving information about Earth’s surface. Marine ecosystems, however, have been studied with less intensity than terrestrial ecosystems due, in part, to data limitations. Data on sea surface temperature (SST) and Chlorophyll-a (Chlo-a) can provide quantitative information of environmental conditions in coastal regions at a high spatial and temporal resolutions. Using the exclusive economic zone of coastal regions as the study area, we compiled monthly and annual statistics of SST and Chlo-a globally for 2003 to 2020. This ready-to-use dataset aims to reduce the computational time and costs for local-, regional-, continental-, and global-level studies of coastal areas. Data may be of interest to researchers in the areas of ecology, oceanography, biogeography, fisheries, and global change. Target applications of the database include environmental monitoring of biodiversity and marine microorganisms, and environmental anomalies.

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Chlorophyll-a, SST and particulate organic carbon in response to the cyclone Amphan in the Bay of Bengal

Cited by 9 publications

References 35 publications

Mesoscale Eddies and their Impact on Primary Productivity in the Bay of Bengal

Mesoscale Eddies and their Impact on Primary Productivity in the Bay of Bengal

The Investigation of the Response Mechanism of SST and Chlorophyll to Super Typhoon “Rey” in the South China Sea

A database of global coastal conditions

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