Past 100 ky surface salinity-gradient response in the Eastern Arabian Sea to the summer monsoon variation recorded by δ18O of G. sacculifer

2005 ◽  
Vol 47 (2-4) ◽  
pp. 135-142 ◽  
Author(s):  
Anjali R. Chodankar ◽  
Virupaxa K. Banakar ◽  
Tadamichi Oba
Keyword(s):  
Summer Monsoon ◽  
Arabian Sea ◽  
Salinity Gradient ◽  
Surface Salinity ◽  
Eastern Arabian Sea

Response of macrozoobenthic communities to summer monsoon upwelling and related hypoxia in the south eastern Arabian Sea shelf

2021 ◽  
Vol 166 ◽  
pp. 105278
Author(s):  
K.U. Abdul Jaleel ◽  
Usha V. Parameswaran ◽  
Aiswarya Gopal ◽  
Chippy Khader ◽  
V.N. Sanjeevan ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Arabian Sea ◽  
The South ◽  
South Eastern ◽  
Eastern Arabian Sea

Long-term history of sediment inputs to the eastern Arabian Sea and its implications for the evolution of the Indian summer monsoon since 3.7 Ma

2018 ◽  
Vol 157 (6) ◽  
pp. 908-919 ◽  
Author(s):  
Mingjiang Cai ◽  
Zhaokai Xu ◽  
Peter D. Clift ◽  
Boo-Keun Khim ◽  
Dhongil Lim ◽  
...  
Keyword(s):  
Clay Minerals ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Arabian Sea ◽  
Sediment Supply ◽  
Deccan Traps ◽  
Indus River ◽  
Eastern Arabian Sea ◽  
Monsoon Intensity ◽  
History Of

AbstractWe present a new set of clay mineral and grain-size data for the siliciclastic sediment fraction from International Ocean Discovery Program (IODP) Site U1456 located in the eastern Arabian Sea to reconstruct the variabilities in the continental erosion and weathering intensity in the western Himalaya, elucidate the sediment source-to-sink processes and discuss the potential controls underlying these changes since 3.7 Ma. The clay minerals mainly consist of smectite (0–90%, average 44%) and illite (3–90%, average 44%), with chlorite (1–26%, average 7%) and kaolinite (0–19%, average 5%) as minor components. The compositional variations in the clay minerals at IODP Site U1456 suggest four phases of sediment provenance: the Indus River (phase 1, 3.7–3.2 Ma), the Indus River and Deccan Traps (phase 2, 3.2–2.6 Ma), the Indus River (phase 3, 2.6–1.2 Ma) and the Indus River and Deccan Traps (phase 4, 1.2–0 Ma). These provenance changes since 3.7 Ma can be correlated with variations in the Indian summer monsoon intensity. The siliciclastic sediments in the eastern Arabian Sea were mainly derived from the Indus River when the Indian summer monsoon was generally weak. In contrast, when the Indian summer monsoon intensified, the siliciclastic sediment supply from the Deccan Traps increased. In particular, this study shows that the smectite/(illite+chlorite) ratio is a sensitive tool for reconstructing the history of the variation in the Indian summer monsoon intensity over the continents surrounding the Arabian Sea since 3.7 Ma.

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

2010 ◽  
Vol 73 (3) ◽  
pp. 535-540 ◽  
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‰.

scholarly journals Internal wave characteristics in the eastern Arabian Sea during summer monsoon

1992 ◽  
Vol 101 (4) ◽  
pp. 317-327
Author(s):  
P G K Murthy ◽  
G S Sharma ◽  
V V James ◽  
K V Suseela
Keyword(s):  
Internal Wave ◽  
Summer Monsoon ◽  
Arabian Sea ◽  
Wave Characteristics ◽  
Eastern Arabian Sea

scholarly journals On the Possible Mechanisms for Saltening of the Bay of Bengal

2019 ◽  
Vol 69 (1) ◽  
pp. 93-103
Author(s):  
Anoopa Prasad C ◽  
P.V. Hareesh Kumar
Keyword(s):  
Bay Of Bengal ◽  
Arabian Sea ◽  
Coastal Upwelling ◽  
Salt Water ◽  
Dominant Role ◽  
Salinity Gradient ◽  
Ekman Transport ◽  
Surface Salinity ◽  
Near Shore ◽  
Lateral Advection

The Bay of Bengal (BoB) is a low saline basin owing to large influx of freshwater from precipitation and river runoff. To maintain the salt balance of the BoB, the incessant lowering of salinity is to be balanced by the inflow of saltier water into the basin. In the present work, various processes that contribute to the saltening of the BoB, viz. coastal upwelling, eddies and their interaction, lateral advection from Arabian Sea and tropical cyclones are discussed. In the near-shore regions, the coastal upwelling due to wind induced Ekman transport plays a dominant role in increasing the surface salinity. On the other hand, in the open ocean, the divergence induced by eddies and their mutual interaction contributes significantly to the salt water pumping. In the southern BoB, the advection from the Arabian Sea increases the salinity. The formation of cyclones in the BoB also leads to an increase in the surface salinity. However, the magnitude of saltening of the Bay due to these processes varies from north to south. The uplift of saltier water from subsurface levels increases the salinity in the surface layers thereby creating a salinity gradient and a salinity front.

Blooms of Trichodesmium erythraeum in the South Eastern Arabian Sea during the onset of 2009 summer monsoon

2010 ◽  
Vol 45 (3) ◽  
pp. 151-157 ◽  
Author(s):  
K. B. Padmakumar ◽  
B. R. Smitha ◽  
Lathika Cicily Thomas ◽  
C. L. Fanimol ◽  
G. SreeRenjima ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Arabian Sea ◽  
The South ◽  
Trichodesmium Erythraeum ◽  
South Eastern ◽  
Eastern Arabian Sea

scholarly journals Influence of Indian summer monsoon variability on the surface waves in the coastal regions of eastern Arabian Sea

2016 ◽  
Vol 34 (10) ◽  
pp. 871-885 ◽  
Author(s):  
V. Sanil Kumar ◽  
Jesbin George
Keyword(s):  
Surface Waves ◽  
Wave Height ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Arabian Sea ◽  
Series Data ◽  
High Positive Correlation ◽  
Monsoon Variability ◽  
Eastern Arabian Sea ◽  
Wavelet Coherence Analysis

Abstract. We assess the influence of monsoon variability on the surface waves using measured wave data covering 7 years and reanalysis data from 1979 to 2015 during the Indian summer monsoon (JJAS) in the eastern Arabian Sea. The inter-annual comparison shows that the percentage of higher wave heights ( >  2.5 m) is higher ( ∼  26%) in 2014 than in other years due to the higher monsoon wind speed (average speed ∼ 7.3 m s−1) in 2014. Due to the delayed monsoon, monthly average significant wave height (Hm0) of June was lowest (∼ 1.5 m) in 2009. The spectral peak shifted to lower frequencies in September due to the reduction of wind seas as a result of decrease in monsoon intensity. The study shows high positive correlation (r ∼ 0.84) between average low-level jet (LLJ) for the block 0–15° N, 50–75° E and Hm0 of eastern Arabian Sea in all the months except in August (r ∼ 0.66). The time series data on wave height shows oscillations with periods 5 to 20 days. Wavelet coherence analysis indicates that the LLJ and Hm0 are in-phase related (phase angle 0°) almost all the time and LLJ leads Hm0. The monsoon seasonal anomaly of Hm0 is found to have a negative relationship with the Oceanic Niño Index indicating that the monsoon average Hm0 is relatively low during the strong El Niño years.

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