Contrasting sea surface temperature of summer and winter monsoon variability in the northern Arabian Sea over the last 25 ka

Böll, Anna; Schulz, Hartmut; Munz, Philipp; Rixen, Tim; Gaye, Birgit; Emeis, Kay–Christian

doi:10.1016/j.palaeo.2015.02.036

Cited by 48 publications

(76 citation statements)

References 81 publications

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“…solation during the glacial (Böll et al, 2014(Böll et al, , 2015Reichart et al, 2004). The observed regional differences in temperature rise from the LGM to the Holocene (Fig.…”

Section: Temperature Differences Between Glacial and The Holocenementioning

confidence: 89%

“…Many studies used productivity proxies and SST reconstructions, often in combination with denitrification proxies such as sedimentary δ 15 N values, to show that warm periods (IS and interglacials) were characterized by a stronger SW monsoon inducing upwelling and higher productivity than cold periods so that denitrification was switched on in the OMZ (Altabet et al, 1999(Altabet et al, , 2002Pichevin et al, 2007;Reichart et al, 1997;Schulte et al, 1999b;Suthhof et al, 2001). After the transition from glacial to interglacial conditions with the warm and cold excursions during the Bølling-Allerød and Younger Dryas (YD; 11.7-12.9 ka BP), respectively, the Holocene was evidently a more stable period of permanent upwelling and denitrification (Böll et al, 2015;Overpeck et al, 1996;Pichevin et al, 2007;Tierney et al, 2016). There are, however, indications that millennial-scale climate oscillations similar to the North Atlantic cold periods detected by Bond et al (1997) also occurred in the monsoon realm, but with reduced amplitude (Azharuddin et al, 2017).…”

Section: Study Areamentioning

confidence: 98%

“…These Holocene cold periods were found to be characterized by reduced precipitation on land and reduced monsoonal upwelling in the Arabian Sea (Gupta et al, 2003). The volume and intensity of the mid-water OMZ appear to have oscillated related to SW monsoon strength, intensity of winter cooling by the NE monsoon, and changes in OMZ ventilation (Böll et al, 2015;Das et al, 2017;Pichevin et al, 2007). Thus, understanding Holocene OMZ dynamics is indispensable to evaluate the recently observed OMZ intensification in the Arabian Sea (Banse et al, 2014;.…”

Section: Study Areamentioning

confidence: 99%

“…A reason for the more latitudinal gradient of glacial isotherms (Fig. 4b) was a strengthened NE and a weakened SW monsoon so that winter cooling in the northern Arabian Sea was much stronger (Reichart et al, 2004) and upwelling was reduced or even inactive during the glacial; the cold water source in the western Arabian Sea was strongly reduced (Böll et al, 2015;Duplessy, 1982). In addition, salinity reconstructions indicate that there was less advection of low-salinity, warm surface waters by the WICC into the eastern Arabian Sea from the Bay of Bengal, probably due to the low glacial precipitation and river runoff .…”

Section: Temperature Differences Between Glacial and The Holocenementioning

confidence: 99%

“…southward temperature increase (Böll et al, 2015). Enhanced upwelling is indicated by a positive or rising index as it shows lower temperatures in the more southern upwelling areas compared to the northern Arabian Sea.…”

Section: Temperature Differences Between Glacial and The Holocenementioning

confidence: 99%

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Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification

et al. 2018

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Abstract. At present, the Arabian Sea has a permanent oxygen minimum zone (OMZ) at water depths between about 100 and 1200 m. Active denitrification in the upper part of the OMZ is recorded by enhanced δ 15 N values in the sediments. Sediment cores show a δ 15 N increase during the middle and late Holocene, which is contrary to the trend in the other two regions of water column denitrification in the eastern tropical North and South Pacific. We calculated composite sea surface temperature (SST) and δ 15 N ratios in time slices of 1000 years of the last 25 kyr to better understand the reasons for the establishment of the Arabian Sea OMZ and its response to changes in the Asian monsoon system. Low δ 15 N values of 4-7 ‰ during the last glacial maximum (LGM) and stadials (Younger Dryas and Heinrich events) suggest that denitrification was inactive or weak during Pleistocene cold phases, while warm interstadials (ISs) had elevated δ 15 N. Fast changes in upwelling intensities and OMZ ventilation from the Antarctic were responsible for these strong millennial-scale variations during the glacial. During the entire Holocene δ 15 N values > 6 ‰ indicate a relatively stable OMZ with enhanced denitrification. The OMZ develops parallel to the strengthening of the SW monsoon and monsoonal upwelling after the LGM. Despite the relatively stable climatic conditions of the Holocene, the δ 15 N records show regionally different trends in the Arabian Sea. In the upwelling areas in the western part of the basin, δ 15 N values are lower during the mid-Holocene (4.2-8.2 ka BP) compared to the late Holocene (< 4.2 ka BP) due to stronger ventilation of the OMZ during the period of the most intense southwest monsoonal upwelling. In contrast, δ 15 N values in the northern and eastern Arabian Sea rose during the last 8 kyr. The displacement of the core of the OMZ from the region of maximum productivity in the western Arabian Sea to its present position in the northeast was established during the middle and late Holocene. This was probably caused by (i) reduced ventilation due to a longer residence time of OMZ waters and (ii) augmented by rising oxygen consumption due to enhanced northeast-monsoon-driven biological productivity. This concurs with the results of the Kiel Climate Model, which show an increase in OMZ volume during the last 9 kyr related to the increasing age of the OMZ water mass.

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“…solation during the glacial (Böll et al, 2014(Böll et al, , 2015Reichart et al, 2004). The observed regional differences in temperature rise from the LGM to the Holocene (Fig.…”

Section: Temperature Differences Between Glacial and The Holocenementioning

confidence: 89%

Section: Study Areamentioning

confidence: 98%

Section: Study Areamentioning

confidence: 99%

Section: Temperature Differences Between Glacial and The Holocenementioning

confidence: 99%

Section: Temperature Differences Between Glacial and The Holocenementioning

confidence: 99%

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Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification

et al. 2018

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Applicability of the Long-chain Diol Index (LDI) as a sea surface temperature proxy in the Arabian Sea

Erdem

Lattaud²,

Erk

et al. 2021

Preprint

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Did the Harappan settlement of Dholavira (India) collapse during the onset of Meghalayan stage drought?

Sengupta

Mukherjee

Bhushan

et al. 2019

J Quaternary Science

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Radiocarbon dating of archaeological carbonates from seven cultural stages of Dholavira, Great Rann of Kachchh (GRK), the largest excavated Harappan settlement in India, suggests the beginning of occupation at ~5500 years BP (pre‐Harappan), and continuation until ~3800 years BP (early part of the Late Harappan period). The settlement rapidly expanded under favourable monsoonal climate conditions when architectural elements such as the Citadel, Bailey, Lower and Middle Town were added between the Early and mid‐Mature Harappan periods. Abundant local mangroves grew around the GRK sustaining prolific populations of the edible gastropod Terebralia palustris. Oxygen isotope (δ18O) sclerochronology of Early Harappan gastropod shell suggests seasonal mixing of some depleted (δ18O ~ −12‰) river water in summer/monsoon months (through ancient Saraswati and/or Indus distributary channels) with seawater that periodically inundated the GRK. Evaporation from this semi‐enclosed water body during the non‐monsoon months enriched the δ18O of water/shell carbonates. The humid fluvial landscape possibly changed due to a catastrophic drought driving the final collapse of the settlement of Dholavira exactly at the onset of the Meghalayan (Late Holocene) stage (~4300–4100 years BP). Indeed, Dholavira presents a classic case for understanding how climate change can increase future drought risk as predicted by the IPCC working group. Copyright © 2019 John Wiley & Sons, Ltd.

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Contrasting sea surface temperature of summer and winter monsoon variability in the northern Arabian Sea over the last 25 ka

Cited by 48 publications

References 81 publications

Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification

Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification

Applicability of the Long-chain Diol Index (LDI) as a sea surface temperature proxy in the Arabian Sea

Did the Harappan settlement of Dholavira (India) collapse during the onset of Meghalayan stage drought?

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