Nitrous oxide emissions from the Arabian Sea: A synthesis

Abstract. We computed high-resolution (1o latitude × 1o longitude) seasonal and annual nitrous oxide (N2O) concentration fields for the Arabian Sea surface layer using a database containing more than 2400 values measured between December 1977 and July 1997. N2O concentrations are highest during the southwest (SW) monsoon along the southern Indian continental shelf. Annual emissions range from 0.33 to 0.70 Tg N2O and are dominated by fluxes from coastal regions during the SW and northeast monsoons. However, the tendency to focus on measurements in locally restricted features in combination with insufficient seasonal data coverage leads to considerable uncertainties of the concentration fields and thus in the flux estimates, especially in the coastal zones of the northern and eastern Arabian Sea.

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Nitrous oxide emissions from the Arabian Sea: A synthesis

Atmospheric Chemistry and Physics ◽

10.5194/acp-1-61-2001 ◽

2001 ◽

Vol 1 (1) ◽

pp. 61-71 ◽

Cited By ~ 54

Author(s):

H. W. Bange ◽

M. O. Andreae ◽

S. Lal ◽

C. S. Law ◽

S. W. A. Naqvi ◽

...

Keyword(s):

Nitrous Oxide ◽

Arabian Sea ◽

Sea Surface ◽

Nitrous Oxide Emissions ◽

N2o Emissions ◽

Coastal Zones ◽

N2o Flux ◽

In Situ Data ◽

Data Coverage

Abstract. We computed high-resolution (1º latitude x 1º longitude) seasonal and annual nitrous oxide (N2O) concentration fields for the Arabian Sea surface layer using a database containing more than 2400 values measured between December 1977 and July 1997. N2O concentrations are highest during the southwest (SW) monsoon along the southern Indian continental shelf. Annual emissions range from 0.33 to 0.70 Tg N2O and are dominated by fluxes from coastal regions during the SW and northeast monsoons. Our revised estimate for the annual N2O flux from the Arabian Sea is much more tightly constrained than the previous consensus derived using averaged in-situ data from a smaller number of studies. However, the tendency to focus on measurements in locally restricted features in combination with insufficient seasonal data coverage leads to considerable uncertainties of the concentration fields and thus in the flux estimates, especially in the coastal zones of the northern and eastern Arabian Sea. The overall mean relative error of the annual N2O emissions from the Arabian Sea was estimated to be at least 65%.

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Evaluation of model simulated and MODIS-Aqua retrieved sea surface chlorophyll in the eastern Arabian Sea

Estuarine Coastal and Shelf Science ◽

10.1016/j.ecss.2016.08.002 ◽

2016 ◽

Vol 181 ◽

pp. 61-69 ◽

Cited By ~ 9

Author(s):

Kunal Chakraborty ◽

Anubhav Gupta ◽

Aneesh A. Lotliker ◽

Gavin Tilstone

Keyword(s):

Arabian Sea ◽

Sea Surface ◽

Eastern Arabian Sea

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Nitrous oxide emissions from the Arabian Sea

Geophysical Research Letters ◽

10.1029/96gl03072 ◽

1996 ◽

Vol 23 (22) ◽

pp. 3175-3178 ◽

Cited By ~ 35

Author(s):

Hermann W. Bange ◽

Spyridon Rapsomanikis ◽

Meinrat O. Andreae

Keyword(s):

Nitrous Oxide ◽

Arabian Sea ◽

Nitrous Oxide Emissions

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Climatology of the Eastern Arabian Sea during the last glacial Cycle reconstructed from paired measurement of foraminiferal δ18O and Mg/Ca

Quaternary Research ◽

10.1016/j.yqres.2010.02.002 ◽

2010 ◽

Vol 73 (3) ◽

pp. 535-540 ◽

Cited By ~ 29

Author(s):

V.K. Banakar ◽

B.S. Mahesh ◽

G. Burr ◽

A.R. Chodankar

Keyword(s):

Time Series ◽

Arabian Sea ◽

Sea Surface ◽

Sea Surface Salinity ◽

Glacial Cycle ◽

Surface Salinity ◽

Last Glacial ◽

Sst Cooling ◽

Eastern Arabian Sea ◽

The Last Glacial

Paired measurements of Mg/Ca and δ18O of Globigerenoides sacculifer from an Eastern Arabian Sea (EAS) sediment core indicate that sea-surface temperature (SST) varied within 2°C and sea-surface salinity within 2 psu during the last 100 ka. SST was coldest (∽ 27°C) during Marine Isotope Stage (MIS) 4 and 2. Sea-surface salinity was highest (∽ 37.5 psu) during most of the last glacial period (∽ 60–18 ka), concurrent with increased δ18O G.sacculifer and C/N ratios of organic matter and indicative of sustained intense winter monsoons. SST time series are influenced by both Greenland and Antarctic climates. However, the sea-surface salinity time series and the deglacial warming in the SST record (beginning at ∽18 ka) compare well with the LR04 benthic δ18O-stack and Antarctic temperatures. This suggests a teleconnection between the climate in the Southern Hemisphere and the EAS. Therefore, the last 100-ka variability in EAS climatology appears to have evolved in response to a combination of global climatic forcings and regional monsoons. The most intense summer monsoons within the Holocene occurred at ∽8 ka and are marked by SST cooling of ∽ 1°C, sea-surface salinity decrease of 0.5 psu, and δ18O G.sacculifer decrease of 0.2‰.

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Climate change drivers influencing Indian mackerel fishery in south-eastern Arabian Sea off Kerala, India

Indian Journal of Fisheries ◽

10.21077/ijf.2020.67.3.92802-01 ◽

2020 ◽

Vol 67 (3) ◽

Author(s):

P U Zacharia ◽

V.H. Sajna ◽

G. Rojith ◽

G.N. Roshen ◽

Dhanya Joseph ◽

...

Keyword(s):

Environmental Variables ◽

Arabian Sea ◽

Southern Oscillation ◽

Sea Surface ◽

Residual Variance ◽

Catch Per Unit Effort ◽

Indian Mackerel ◽

South Eastern ◽

Eastern Arabian Sea ◽

Positive Direct

The Indian mackerel Rastrelligerkanagurta(Cuvier, 1816) is one of the most important marine fishery resources along the south-eastern Arabian Sea along the coast of Kerala, south India. The effect of selected environmental variables on the Relative effort (Effort) and weighted catch per unit effort (cpue)of the fish were investigated using simple correlation and Path analysis. Six major oceanographic variables, namely sea surface temperature (SST), sea surface chlorophyll-a concentration (SSC), sea surface salinity (SSS), Precipitation (Pr) Indian Ocean Dipole (IOD) and Southern Oscillation Index (SOI) (ENSO index) were selected for the present study. Among these SST had the highest direct negative effect (-0.282, p<0.01), followed by SSS (-0.152, p<0.1) and IOD (-0.006, p<0.01). The highest positive direct effect on the cpue was exhibited by Pr (0.514, p<0.001) followed by SSC and SOI (0.178, p<0.01). The environmental variables also exerted indirect effects on cpue through Effort. The residual variance indicated that there are spurious effects exerted by environmental variables not included in the study. According to the coefficient of determination (R2), the relative importance of the influence of causally dependent environmental variables on the cpue of Indian mackerel is Pr> SSC >SSS.

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