Evolution of productivity and monsoonal dynamics in the eastern Arabian Sea during the past 68ka using dinoflagellate cyst records

Rapid switch in monsoon-wind induced surface hydrographic conditions of the eastern Arabian Sea during the last deglaciation

“…This is not necessarily new, because this pattern of coupling between Arabian Sea low productivity and northern hemisphere cold climate events has been previously reported using a wide variety of proxy data series in cores from across the Arabian Sea (Schulz et al, 1998;Altabet et al, 2002;Ivanochko et al, 2005;Singh et al, 2006Singh et al, , 2011. It is intriguing to note that a record of changes in dinoflagellate assemblage data, from another deep core offshore Goa (water depth; 1807 m), suggested also low productivity during H1 (Narale et al, 2015). The weak response of coccolithophores to millennial-scale climate change as evident in figure 4 is anomalous.…”

Geochemical Records of the Provenance and Silicate Weathering/Erosion From the Eastern Arabian Sea and Their Responses to the Indian Summer Monsoon Since the Mid‐Pleistocene

“…The Indus Fan, which is the second largest submarine fan in the world (1.1–1.25 × 10 6 km 2 , Prins & Postma, 2000), is mainly fed by the Indus River system (400 Mt/yr) originating in the Western Himalaya and, to a lesser extent, by rivers from the Deccan Traps (e.g., Narmada and Tapti Rivers; 100 Mt/yr) and gneissic rocks of the Indian subcontinent (e.g., Nethravathi River and Periyar River) as well as eolian dust from the deserts of Arabia and western India (<30 Mt/yr) (Milliman & Farnsworth, 2011; Goswami et al, 2012; Pandey et al, 2016; Figure 1). The Indus River system and Indian subcontinent are dominated by the monsoonal climate, with peak fluvial discharges generated during summer monsoon seasons (Ali et al, 2015; Bookhagen et al, 2005; Narale et al, 2015). Large amounts of the sediments supplied from the Western Himalaya and Indian subcontinent are well preserved in the deep‐water archives of the Arabian Sea, especially in the Indus Fan, which constitutes an ideal place to examine the linkage between silicate weathering/erosion and the climate system (Goswami et al, 2012; Pandey et al, 2016).…”

Dinocysts as a Tool for Palaeoenvironmental Reconstruction in Vitória Bay, Brazil

“…The presence of saline water in the estuarine system due to the marine transgression observed during the Holocene on the Espírito Santo shore could have favored the establishment of an oligotrophic environment, such as that observed on both the Gulf Coast of Aqaba and the Red Sea (Elshanawany and Zonneveld 2016). Narale et al (2015) point out that Spiniferites species are good indicators of hypersaline conditions. Similarly, the low TOC values associated with coarser sediment could be directly correlated with the preservation and deposition of dinocysts (Tian et al 2018).…”

“…O. centrocarpum and S. ramosus have been found within different temperature and salinity ranges (Zonneveld et al 2013). Narale et al (2015) points out that Spiniferites species are important indicators of hypersaline conditions. The core samples containing the highest numbers of preserved cysts also contained the highest accumulation of foraminiferal test linings in this sediment core, indicating higher environmental salinity (Stancliffe 1996).…”