Solar insolation driven periodicities in southwest monsoon and its impact on NE Arabian Sea paleoceanography

作     者：Syed Azharuddin Pawan Govil Arun Deo Singh Ravi Mishra Mayank Shekhar 

作者机构：Birbal Sahni Institute of PalaeosciencesLucknowU.P.226007India Department of GeologyBanaras Hindu UniversityVaranasi221005India National Centre for Antarctic and Ocean ResearchVasco-da-GamaGoa403804India 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2019年第10卷第6期

页      面：2251-2263页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：SERB-DST Project No.SR/FTP/ES-53/2013 Council of Scientific and Industrial Research(CSIR)(Grant No.09/528/0022/2018/EMR-1)for the financial assistance in the form of fellowships supported by fast-track grant of SERB-DST under project No.SR/FTP/ES-53/2013 

主　　题：Southwest monsoon Periodicities Arabian sea Spectral analysis Foraminifera 

摘      要：In the northeastern(NE) Arabian Sea,the fluctuation in terrestrial and freshwater runoff directly depends on southwest monsoon(SWM) precipitation as well as the meltwater flux provided by Indus ***,analysis of multi-proxy spectral signatures was carried out to trace the high-resolution SWM periodicities and their influence on the productivity,regional sea level fluctuations and depositional processes in the NE Arabian *** time series data of stable isotopes of oxygen(δ^18 O(***)).carbon(δ^13 C(***) and δ^13 C(org)) and nitrogen(δ^15 N).Total Organic Carbon(TOC),planktic-benthic foraminiferal ratio(P/B ratio) and63 μm coarse fraction(CF) were used from two coastal sedimentary cores located offshore Saurashtra,NE Arabian Sea(Core SK-240/485 having 88 m water depth;Core GC/SK-240/496 having 174 m water depth).The REDFIT based spectral analysis recorded significant periodicities(90% significance) in δ^18 0 time series centered at^1609,~667,~525,~296,~290 and^256 ***,the significant periodicities recorded in carbon isotopes time series(δ^13 C(***) and δ^13 C(org))centered at^681,~512,~471,~452,~438,~360,~292,~275,~269,~245 and^209 *** significant periodicities in TOC include^471 and-322 years whereas δ^15 N time series recorded significant periodicity centered at-360 *** significant periodicities in P/B ratio time series centered at^512,~388,~304,~250,~235,~217,~152,~139 and^135 years while CF recorded^268,~216,~209,~198,~188,~173 and^140 years significant *** observed periodicities in the multi-proxy record consist of similar cycles(within the radiocarbon dating error) which also natch with previously reported solar insolation influenced SWM and other global and regional ***,the stationarity of the data has been verified using wavelet analysis and shows similar periodicities as observed in REDFIT ***,the depositional behaviour was studied using correlation analysis of the common