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Response of surface chlorophyll to aerosol dust input in the Central Arabian Sea

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Title Response of surface chlorophyll to aerosol dust input in the Central Arabian Sea
 
Creator Roy, R
Prakash, S
Lotliker, A
Sudhakaran, P S
Choudhury, S B
 
Subject Aerosol
Arabian Sea
Chlorophyll
Summer monsoon
 
Description 297-303
The decadal trends in satellite-derived surface chlorophyll in conjunction with Aerosol Optical Depth (AOD) are
explored in a unique area in the central Arabian Sea, known to mimic High Nutrient and Low Chlorophyll (HNLC) like
conditions during late summer monsoon. The analysis indicates two recurring seasonal blooms, possibly associated with
distinct biogeochemical processes in the studied region. Furthermore, the mineral dust deposition in July every year
coincides with one such increase in surface chlorophyll followed by a lag period until winter monsoon. This rapid increase
in the phytoplankton biomass just after the aeolian input is possibly due to an enhancement in soluble iron within the mixed
layer, as suggested by AOD dust data. Most likely, this rapid increase in biomass may induce further depletion of soluble
iron leading to HNLC-like conditions during the late Summer Monsoon, as reported earlier. This hypothesis is consistent
with the satellite observation, which shows a decrease in surface chlorophyll during subsequent months until the convective
mixing between December – January (winter monsoon). The study reveals that the presence of the HNLC region in the
central Arabian Sea during the summer monsoon is not perennial like the Southern Ocean. Instead, it is a transient
phenomenon primarily controlled by aerosol deposition and rapid uptake of soluble iron, which facilitate the diatom blooms
as suggested by the recent output from the NASA Ocean Biogeochemical Model (NOBM).
 
Date 2022-07-28T11:33:17Z
2022-07-28T11:33:17Z
2022-04
 
Type Article
 
Identifier 2582-6727 (Online); 2582-6506 (Print)
http://nopr.niscpr.res.in/handle/123456789/60195
 
Language en
en
 
Publisher NIScPR-CSIR,India
 
Source IJMS Vol.51(04) [April 2022]