Surficial clay mineral distribution on the southwestern continental margin of India: evidence of input from the Bay of Bengal

Chauhan, O.S.; Gujar, A.R.

doi:10.1016/0278-4343(95)00015-s

Cited by 30 publications

(15 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the SWM (June-September) in the coastal region precipitation is moderate (150 cm). Because of enhanced moisture condensation by orographic influence, inland precipitation increases to $500 cm in the Western Ghats, the hilly region adjacent to coastal plains (Chauhan and Gujar, 1996;Fig. 1).…”

Section: Modern Climatology and Hydrographymentioning

confidence: 99%

Reconstruction of the variability of the southwest monsoon during the past 3 ka, from the continental margin of the southeastern Arabian Sea

Chauhan

Vogelsang

Basavaiah

et al. 2009

J Quaternary Science

Self Cite

View full text Add to dashboard Cite

2010. Reconstruction of the variability of the southwest monsoon during the past 3 ka, from the continental margin of the southeastern Arabian Sea.ABSTRACT: From temporal variation in d 18 O in Globigerinoides ruber and G. sacculifer and geochemical indices of weathering/erosion (chemical index of alteration, Al and Ti), we infer rapid southwest monsoon (SWM) deterioration with dwindling fluvial and detrital fluxes at ca. 450-650, 1000 and 1800-2200 cal. a BP during the late Holocene. We have evaluated the role of solar influx (reconstructed) and high-latitude climate variability (archived in GRIP and GISP-2 cores) on SWM precipitation. Broadly, our d 18 O climate reconstruction is concordant with GRIP and GISP-2, and supports a teleconnection through atmospheric connection between the SWM and the North Atlantic climate -albeit temporal extents of the Little Ice Age and Medieval Warm Period from high latitude are not entirely coeval. Moreover, there is a humid climate and enhanced precipitation during the terminal stages of the Little Ice Age. The medieval warming (ca. AD 800-1300) is not synchronous either, and is punctuated by an arid event centred at 1000 a BP. Although the delineation of the specific influence of solar influx on SWM precipitation is elusive, we surmise that SWM precipitation is a complex phenomenon and local orography along southwestern India may have a role on the entrapment of moisture from the southwest trade winds, when these hit land.

show abstract

Section: Modern Climatology and Hydrographymentioning

confidence: 99%

Reconstruction of the variability of the southwest monsoon during the past 3 ka, from the continental margin of the southeastern Arabian Sea

Chauhan

Vogelsang

Basavaiah

et al. 2009

J Quaternary Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…For example, investigations of surface sediments in the Arabian Sea suggest that supply from the Himalaya, Transhimalaya and Karakorum ranges brought via the Indus dominate in the northern and central regions [Garzanti et al, 2005], whereas the sediments off the shelf and slope regions of the eastern Arabian Sea are sourced mainly from peninsular India [Chauhan and Gujar, 1996;Chauhan et al, 2010;Kessarkar et al, 2003;Kolla et al, 1976;Rao and Rao, 1995]. There is also evidence based on clay mineral studies of sediments from the southwestern slope of India that suggest long range transport of Ganga-Brahmaputra sediments to the tip of Indian peninsula by surface currents [Chauhan and Gujar, 1996;Chauhan et al, 2010].…”

Section: Introductionmentioning

confidence: 99%

Temporal variations in ⁸⁷Sr/⁸⁶Sr and ɛ_Nd in sediments of the southeastern Arabian Sea: Impact of monsoon and surface water circulation

Goswami

Singh

Bhushan

et al. 2012

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Sr and Nd isotopic composition of silicate fractions of sediments have been measured in two well dated gravity cores from the eastern Arabian Sea archiving a depositional history of ∼29 and ∼40 ka. The 87Sr/86Sr and ɛNd in the northern core (SS‐3104G; 12.8°N, 71.7°E) ranges from 0.71416 to 0.71840 and −8.8 to −12.8; these variations are limited compared to those in the southeastern core (SS‐3101G; 6.0°N, 74.0°E), in which they vary from 0.71412 to 0.72069 and −9.0 to −15.2 respectively. This suggests that the variation in the relative proportions of sediments supplied from different sources to the core SS‐3104G are limited compared to core SS‐3101G. The 87Sr/86Sr and ɛNd profiles of SS‐3101G exhibit two major excursions, ca. 9 ka and 20 ka, coinciding with periods of Holocene Intensified Monsoon Phase (IMP) and the Last Glacial Maximum (LGM) respectively with more radiogenic 87Sr/86Sr and lower ɛNd during these periods. These excursions have been explained in terms of changes in the erosion patterns in the source regions and surface circulation of the Northern Indian Ocean resulting from monsoon intensity variations. The intensification of North‐East (NE) monsoon and associated strengthening of the East Indian Coastal Current in southwest direction during LGM transported sediments with higher 87Sr/86Sr and lower ɛNd from the western Bay of Bengal to the Arabian Sea. In contrast, enhanced South‐West (SW) monsoon at ∼9 ka facilitated the transport of sediments from the northern Arabian Sea, particularly Indus derived, to the southeastern Arabian Sea. This study thus highlights the impact of monsoon variability on erosion patterns and ocean surface currents on the dispersal of sediments in determining the Sr and Nd isotopic composition of sediments deposited in the eastern Arabian Sea during the last ∼40 ka.

show abstract

“…We therefore infer substantial subsurface flux through water column processes over the inner shelf. however, has exposed, relict, coarse, carbonate detritus over the entire mid-outer shelf (age 8.0-9.1 × 10 3 Before Present (BP); Hashimi and Nair 1981, 1986, Chauhan and Gujar 1996, Vora et al 1996. Clays and fine-silt size detritus are conspicuous by their absence at the seabed.…”

Section: Discussionmentioning

confidence: 97%

“…It is designed to obtain a synoptic view of phytoplankton pigments, coloured dissolved organic matter and suspended particulate matter, and is found to be useful for obtaining subweekly synoptic patterns of TSM (table 1). For this study, the continental margin of the SE Arabian Sea was chosen because, besides having an intense SWM precipitation regime, it (i) has upwelling regimes; (ii) has seasonality in wind and hydrography; and (iii) lies in a tropical humid climatic zone with a network of high-gradient rivers (Chauhan and Gujar 1996), which inhibit the possibility of large-scale sequestering of suspended particulate matter in the delta, as found in the large rivers debouching into the Bay of Bengal. From the information derived from the monthly TSM patterns, and the seasonal variations in current and wind regimes, this study attempts to decipher processes that regulate dispersal and sequester pathways of TSM over the SW continental margin of India.…”

Section: Introductionmentioning

confidence: 99%

Dispersal and sink pathways of suspended particulate matter from the orographically enhanced SWM regime of the SE Arabian Sea

Chauhan

Kader

Vaidya

et al. 2012

International Journal of Remote Sensing

View full text Add to dashboard Cite

The magnitude of precipitation plays an important role in the yield and supply of terrigenous matter into the sea through fluvial supply. The influence of climate on the influx of total suspended matter (TSM) into the continental margin of the SE Arabian Sea has been evaluated from subweekly synoptic variations in TSM and its advection rates, currents and winds during the southwest monsoon (SWM) and postmonsoon season. Our study endorses the high influx of TSM during the SWM (>82 mg l −1 ; advection 26-110 mg m −2 s −1 ), albeit that most of it is sequestered into the shallow coastal region. Over the mid-outer shelf, there is uniformly low TSM (12-24 mg l −1 ) and a weak TSM advection (9-4 mg m −2 s −1 ) throughout the year. This trend is persistent also in areas having upwelling-induced high marine productivity. We therefore surmise that higher fluvial influx and primary production during the SWM do not necessarily enhance the supply of particulate matter into the deeper offshore regions of the SE Arabian Sea. We ascribe a vital role to the prevailing morphodynamic processes.

show abstract

Surficial clay mineral distribution on the southwestern continental margin of India: evidence of input from the Bay of Bengal

Cited by 30 publications

References 17 publications

Reconstruction of the variability of the southwest monsoon during the past 3 ka, from the continental margin of the southeastern Arabian Sea

Reconstruction of the variability of the southwest monsoon during the past 3 ka, from the continental margin of the southeastern Arabian Sea

Temporal variations in ⁸⁷Sr/⁸⁶Sr and ɛ_Nd in sediments of the southeastern Arabian Sea: Impact of monsoon and surface water circulation

Dispersal and sink pathways of suspended particulate matter from the orographically enhanced SWM regime of the SE Arabian Sea

Contact Info

Product

Resources

About

Surficial clay mineral distribution on the southwestern continental margin of India: evidence of input from the Bay of Bengal

Cited by 30 publications

References 17 publications

Reconstruction of the variability of the southwest monsoon during the past 3 ka, from the continental margin of the southeastern Arabian Sea

Reconstruction of the variability of the southwest monsoon during the past 3 ka, from the continental margin of the southeastern Arabian Sea

Temporal variations in 87Sr/86Sr and ɛNd in sediments of the southeastern Arabian Sea: Impact of monsoon and surface water circulation

Dispersal and sink pathways of suspended particulate matter from the orographically enhanced SWM regime of the SE Arabian Sea

Contact Info

Product

Resources

About

Temporal variations in ⁸⁷Sr/⁸⁶Sr and ɛ_Nd in sediments of the southeastern Arabian Sea: Impact of monsoon and surface water circulation