Climatology, trend of aerosol-cloud parameters and their correlation over the Northern Indian Ocean  

作　　者：Harshbardhan Kumar Shani Tiwari 

机构地区：[1]Academy of Scientific and Innovative Research(AcSIR),Ghaziabad,201002,India [2]Aerosol and Cloud Research Lab,Geological Oceanography Division,CSIR–National Institute of Oceanography,Goa,403004,India

出　　处：《Geoscience Frontiers》2023年第4期173-186,共14页地学前缘（英文版）

摘　　要：Aerosols are one of the important atmospheric constituents and exert indirect impact on climate through the modification of microphysical and radiative properties of clouds that in turn perturb the precipitation pattern.Thus,the long term quantification of changes in aerosol and cloud characteristics and their interactions on both temporal as well as spatial scale will provide a crucial information for the better assessment of future climate change.In present study,18 years(2003-2020)MODerate Resolution Imaging Spectro-radiometer(MODIS)derived aerosol-cloud dataset over the Northern Indian Ocean(NIO)were analysed to assess climatology and trend of aerosol,cloud characteristics and their correlation.We found a strong heterogeneity in spatio-temporal variation of aerosol and cloud parameters over the NIO that are more prominent for the coastal region.The climatological mean of aerosol loading is found high(AOD≥0.5)over the outflow region along the Indian sub-continent and low(AOD≤0.2)over the northern equatorial open ocean.The climatological mean of cloud properties shows dominance of optically thicker deep convective(CTP<600 hPa and CTT<260 K)clouds over the southern Bay of Bengal(BoB)and thinner shallow(CTP>700 hPa and CTT>273 K)over the northwestern Arabian Sea(AS).Similarly,bigger effective radii(>17µm)observed along the equatorial open ocean whereas smaller CER(<17µm)were found over Indian sub-continental coastline and western AS.Further,trend analysis reveals an increasing pattern in AOD(0.002 yr^(-1)),CER(0.051µm yr^(-1)),LWP(0.033 gm^(-2) yr^(-1))and CF(0.002 yr^(-1))while COD,CTT and CTP show negative trend in order of-0.005 yr^(-1),-0.094 K yr^(-1) and-1.160 hPa yr^(-1),respectively.We also perform similar analysis for seven sub-region of interest(R1 to R7)across the NIO and results show a decreasing pattern in AOD(-0.001 yr^(-1))at R4 against maximum mean AOD(0.44±0.03).However,coastal sub-regions R1 and R5 illustrate maximum increase in aerosol loading(>0.003 yr^(-1))suggesting a significant imp

关 键 词：AEROSOL Cloud properties Northern Indian Ocean CLIMATOLOGY TREND CORRELATION 

分 类 号：P738[天文地球—海洋地质] P581[天文地球—海洋科学] P736.22