Shelf exposure influence on Indo-Pacific Warm Pool climate for the last 450,000 years

Windler, Grace; Tierney, Jessica E.; DiNezio, Pedro; Gibson, K.; Thunell, Robert C.

doi:10.1016/j.epsl.2019.03.038

Cited by 38 publications

(47 citation statements)

References 45 publications

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“…It is challenging to compare variations in continental shelf area across the entire glaciation phase to hydroclimate records since only one δ 13 C wax record (that from MD98-2152; Windler et al, 2019) extends through the last glacial cycle (Figure 2d). Nevertheless, this δ 13 C wax record shows depleted values, representing a wet period, at 100 ka, which coincides with greater submergence of the continental shelves (Figure 2d).…”

Section: Discussionmentioning

confidence: 99%

“…The magnitude of this excursion varies significantly between the records; however, this does not reject the continental shelf exposure hypothesis, as differences in δ 13 C wax magnitude are to be expected given the setting of the three records. Previous work on Sulawesi has shown that δ 13 C wax variations in marine records, such as that of Windler et al (2019), are generally smaller than in terrestrial records, likely due to much larger source areas for waxes (Konecky et al, 2016;Wicaksono et al, 2015). Further, Wicaksono et al (2015) show that the smaller amplitude of δ 13 C wax variations observed in Lake Matano relative to Lake Towuti is likely due to the higher elevation of Matano, which supports higher mean annual precipitation, as well as the geomorphology of Lake Towuti, which is more conducive to grasslands.…”

Section: Variability In Hydroclimate Recordsmentioning

confidence: 99%

“…Figures 2b-2d show records of δ 13 C wax in three different locations in the Indo-Pacific region, including records in lake sediments in Sulawesi and marine sediments off the Sumatra coast (Russell et al, 2014;Wicaksono et al, 2015;Windler et al, 2019), which all show an increase in δ 13 C wax values beginning at mid-MIS 3 (50-35 ka).…”

Section: Proxy Records For Past Hydroclimatementioning

confidence: 99%

“…(a) Continental shelf exposure area is calculated from glacial isostatic adjustment simulations based on the ice histories inFigure 1for the Sahul and Sunda shelves for Waelbroeck (orange) and ICE-PC2 (blue). Records of δ 13 C in leaf waxes from (b) Lake Towuti(Russell et al, 2014), (c) Lake Matano(Wicaksono et al, 2015), and (d)MD98-2152 (purple;Windler et al, 2019). (e) Greenhouse gas forcing (W/m 2 ) from Schilt et al (2010).…”

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confidence: 99%

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Recent Constraints on MIS 3 Sea Level Support Role of Continental Shelf Exposure as a Control on Indo‐Pacific Hydroclimate

Pico

McGee

Russell

et al. 2020

Paleoceanog and Paleoclimatol

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The mechanisms controlling changes in atmospheric circulation and rainfall over the Indo‐Pacific Warm Pool (IPWP) on glacial‐interglacial timescales remain a subject of considerable debate. Continental shelf exposure, through sea‐level drawdown during glacial periods, has been proposed as an important and possibly dominant control on rainfall intensity over the IPWP and Indian Ocean. However, longer records of hydroclimate change undermine this shelf exposure hypothesis. In particular, trends in some proxy records of rainfall do not track the extent of continental shelf exposure inferred from global benthic oxygen isotope records during Marine Isotope Stage 3 (MIS 3). We revisit the hypothesis that continental shelf exposure controls IPWP precipitation using the latest constraints on ice‐age sea level. Recent studies on the timing and magnitude of global mean sea level during mid‐MIS 3 (~45) suggest significantly higher peak sea level relative to previous work. Our gravitationally self‐consistent glacial isostatic adjustment sea‐level reconstructions, which adopt recent constraints on MIS 3 sea level, predict a transition from widely inundated to exposed shelves in the Indo‐Pacific region from mid‐MIS 3 to the beginning of the Last Glacial Maximum (LGM, ~19–26 ka). Over this same time period, proxy records of vegetation and hydrology from central Indonesia suggest a transition from wetter conditions during mid‐MIS 3 to drier conditions during the LGM. Our new calculations thus negate prior criticisms related to the timing and extent of shelf exposure, indicating that shelf exposure may remain an important driver for hydroclimate variability in the IPWP region on glacial‐interglacial timescales.

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Section: Discussionmentioning

confidence: 99%

Section: Variability In Hydroclimate Recordsmentioning

confidence: 99%

Section: Proxy Records For Past Hydroclimatementioning

confidence: 99%

mentioning

confidence: 99%

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Recent Constraints on MIS 3 Sea Level Support Role of Continental Shelf Exposure as a Control on Indo‐Pacific Hydroclimate

Pico

McGee

Russell

et al. 2020

Paleoceanog and Paleoclimatol

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“…MD98‐2152 (6.33°S, 103.88°E) was recovered from a water depth of 1,796 m and is approximately 30.5 m long. Details regarding the age model for MD98‐2152 have been previously described by Windler et al (2019). Briefly, two radiocarbon dates near the top of the core constrain the age‐depth relationship spanning the LGM.…”

Section: Methodsmentioning

confidence: 99%

Unraveling Glacial Hydroclimate in the Indo‐Pacific Warm Pool: Perspectives From Water Isotopes

Windler

Tierney

Zhu

et al. 2020

Paleoceanog and Paleoclimatol

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The Indo-Pacific Warm Pool (IPWP) is home to the warmest sea surface temperatures in the world oceans, favoring strong tropospheric convection and heavy rainfall. The mechanisms controlling long-term change in the region's hydroclimate are still uncertain. Here, we present a 450,000-year record of precipitation δD from southern Sumatra that records a consistent pattern of glacial isotopic enrichment and interglacial depletion. We synthesize existing paleo-indicators of precipitation δD and δ 18 O in the IPWP and compare results with water isotope-enabled climate simulations of the Last Glacial Maximum (LGM). The simulations show glacial isotopic enrichment over the eastern Indian Ocean extending into the southern IPWP and isotopic depletion over Southeast Asia, the west Pacific, and Australia. The pattern of simulated LGM isotopic change agrees generally well with our proxy synthesis. We conclude that reorganization of regional circulation under glacial conditions controls precipitation isotope variability in the IPWP: Low-level tropospheric convergence dominates the signal in the north/east, whereas divergence controls the response in the south/west. Additional sensitivity simulations suggest that the LGM ice sheets and the associated lowering in sea level, rather than decreased greenhouse gases, are responsible for the distinctive spatial pattern in glacial changes of precipitation isotopes and hydroclimate across the IPWP.

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Southern hemisphere monsoonal system during superinterglacial stages: MIS5e, MIS11c and MIS31

et al. 2023

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Based on coupled climate experiments conducted with the coupled ICTP-CGCM model focusing on interglacial stages MIS5e (127 ka), MIS11c (409 ka) and MIS31 (1,072 ka), the Austral summer monsoonal system is investigated. The interannual variability and intensity of monsoon events are analysed from vorticity indices and air-sea interaction processes for Africa, Australia and South America monsoons. Results demonstrated with respect to present day conditions, an orbital driven decrease in precipitation in summer, but slightly shift of the onset and demise periods of monsoons. Sensitivity experiments indicate, furthermore, that the monsoons are forced not only by external factors such as the dominant effect of insolation, but also by distant climate anomalies, such as surface temperature of the equatorial Atlantic and Pacific basins. During the interglacial stages, cooling occurs in the Southern Hemisphere whereas Northern Hemisphere substantially warms, inducing remarkable changes in the position of the oceanic subtropical high pressure systems and equatorial convergence zone. Regionally, these mechanisms contribute to periods of drought, with reduced precipitation rate over sectors of the Amazon and Northeastern Brazil, northern Australia and southern Africa. Monsoonal rainfall shows different responses to precessional forcing, as well as the relationship between the monsoon and Niño 3.4 differs among the interglacial stages. Compared to current climate, correlation

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Shelf exposure influence on Indo-Pacific Warm Pool climate for the last 450,000 years

Cited by 38 publications

References 45 publications

Recent Constraints on MIS 3 Sea Level Support Role of Continental Shelf Exposure as a Control on Indo‐Pacific Hydroclimate

Recent Constraints on MIS 3 Sea Level Support Role of Continental Shelf Exposure as a Control on Indo‐Pacific Hydroclimate

Unraveling Glacial Hydroclimate in the Indo‐Pacific Warm Pool: Perspectives From Water Isotopes

Southern hemisphere monsoonal system during superinterglacial stages: MIS5e, MIS11c and MIS31

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