Changes in ITCZ location and cross-equatorial heat transport at the Last Glacial Maximum, Heinrich Stadial 1, and the mid-Holocene

McGee, David; Donohoe, Aaron; Marshall, John; Ferreira, David

doi:10.1016/j.epsl.2013.12.043

Cited by 289 publications

(313 citation statements)

References 60 publications

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“…The annual mean precipitation increases in most monsoon regions by up to 7% in this case which is mainly due to the residual CO 2 induced warming in the tropics. In the GLOBAL case, there is very little ITCZ shift and precipitation changes in The ITCZ shifts are associated with changes in AHT eq as shown in many previous studies Frierson and Hwang 2011;McGee et al 2013). We find an increase in northward AHT eq in the ARCTIC and POLAR cases relative to the CTL case, and this increase is associated with the southward shift in ITCZ.…”

Section: Discussionsupporting

confidence: 57%

“…Similar to past studies McGee et al 2013;Devaraju et al 2015) we investigate the Fig. 7 Latitudinal profile of annual mean northward atmospheric heat transport anomalies relative to the CTL case for the 2XCO2, ARCTIC, POLAR and GLOBAL cases.…”

Section: Itcz Shifts and Atmospheric Heat Transportmentioning

confidence: 82%

“…We notice from Table 5 that a larger AHT eq would correspond to a more southward location of P cent . Since the AHT eq changes are driven by changes in the temperature gradient between the hemispheres, McGee et al 2013), we also analyse the hemispherical temperature gradient (∆T h ), defined as the difference between the northern and southern hemisphere's mean surface temperature.…”

Section: Itcz Shifts and Atmospheric Heat Transportmentioning

confidence: 99%

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Effects of Arctic geoengineering on precipitation in the tropical monsoon regions

2017

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due to Arctic geoengineering, but there is still a residual precipitation increase (up to 7%) in most monsoon regions associated with the residual CO 2 induced warming in the tropics. The ITCZ shift due to our Global geoengineering simulation, where aerosols (20 Mt) are prescribed uniformly around the globe, is much smaller and the precipitation changes in most monsoon regions are within ±2% as the residual CO 2 -induced warming in the tropics is also much less than in Arctic and Polar geoengineering. Further, global geoengineering nearly offsets the Arctic warming. Based on our results we infer that Arctic geoengineering leads to ITCZ shift and leaves residual CO 2 induced warming in the tropics resulting in substantial precipitation decreases (increases) in the Northern (Southern) hemisphere monsoon regions.

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Section: Discussionsupporting

confidence: 57%

Section: Itcz Shifts and Atmospheric Heat Transportmentioning

confidence: 82%

Section: Itcz Shifts and Atmospheric Heat Transportmentioning

confidence: 99%

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Effects of Arctic geoengineering on precipitation in the tropical monsoon regions

2017

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“…A similar pattern of δ 18 O SW−IVC between the N-and S-IPWP suggests that hydrological conditions in the two regions were governed by the same factor(s), probably related to Northern Atlantic cold perturbations (Shakun and Carlson, 2010). It has also been suggested that a major δ 18 O SW−IVC increase during the H1 and YD periods in the IPWP region likely resulted from reduced precipitation and oceanic advection in both the N-IPWP and S-IPWP regions (Gibbons et al, 2014;McGee et al, 2014).…”

Section: N-and S-ipwp δ 18 O Sw−ivc Recordsmentioning

confidence: 92%

“…5a) indicates a meridionally dynamic IPWP through the last termination period. This N-S SST gradient variability would also affect interhemispheric air flow and heat transport (Gibbons et al, 2014;McGee et al, 2014), providing a mechanism to explain heat transport variability between the hemispheres on a millennial timescale.…”

Section: Millennial Timescale Variations Of N-and S-ipwp Sst Stacksmentioning

confidence: 99%

Millennial meridional dynamics of the Indo-Pacific Warm Pool during the last termination

Shen

Wei

et al. 2014

Clim. Past

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Abstract.To develop an in-depth understanding of the natural dynamics of the Indo-Pacific Warm Pool (IPWP) during the last deglaciation, stacked north-(N-) and south-IPWP (S-IPWP) thermal and hydrological records over the past 23-10.5 ka were built using planktonic foraminiferal geochemistry data from a new core, MD05-2925 (9.3 • S, 151.5 • E, water depth 1661 m) in the Solomon Sea and eleven previous sites. Ice-volume-corrected seawater δ 18 O (δ 18 O SW−IVC ) stacks show that S-IPWP δ 18 O SW−IVC values are indistinguishable from their northern counterparts through glacial time. The N-IPWP SST (sea surface temperature) stacked record features an increasing trend of 0.5 • C ka −1 since 18 ka. Its S-IPWP counterpart shows an earlier onset of temperature increase at 19 ka and a strong teleconnection to high-latitude climate in the Southern Hemisphere. Meridional SST gradients between the N-and S-IPWP were 1-1.5 • C during the Bølling/Allerød period and 1 • C during both Heinrich event 1 and the Younger Dryas, due to a warmer S-IPWP. A warm S-IPWP during the cold events could weaken the southern hemispheric branch of the Hadley cell and reduce precipitation in the Asian monsoon region.

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Precipitation variability within the West Pacific Warm Pool over the past 120 ka: Evidence from the Davao Gulf, southern Philippines

et al. 2014

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Proxy records of hydrologic variability in the West Pacific Warm Pool (WPWP) have revealed wide-scale changes in past convective activity in response to orbital and suborbital climate forcings. However, attributing proxy responses to regional changes in WPWP hydrology versus local variations in precipitation requires independent records linking the terrestrial and marine realms. We present high-resolution stable isotope, U K′ 37 sea surface temperature, X-ray fluorescence (XRF) core scanning, and coccolithophore-derived paleoproductivity records covering the past 120 ka from International Marine Global Change (IMAGES) Program Core MD06-3075 (6°29′N, 125°50′E, water depth 1878 m), situated in the Davao Gulf on the southern side of Mindanao. XRF-derived log(Fe/Ca) records provide a robust proxy for runoff-driven sedimentary discharge from Mindanao, while past changes in local productivity are associated with variable freshwater runoff and stratification of the surface layer. Significant precessional-scale variability in sedimentary discharge occurred during marine isotope stage (MIS) 5, with peaks in discharge contemporaneous with Northern Hemisphere summer insolation minima. We attribute these changes to the latitudinal migration of the Intertropical Convergence Zone (ITCZ) over the WPWP together with variability in the strength of the Walker circulation acting on precessional timescales. Between 60 and 15 ka sedimentary discharge at Mindanao was muted, displaying little orbital-or millennial-scale variability, likely in response to weakened precessional insolation forcing and lower sea level driving increased subsidence of air masses over the exposed Sunda Shelf. These results highlight the high degree of local variability in the precipitation response to past climate changes in the WPWP.

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Changes in ITCZ location and cross-equatorial heat transport at the Last Glacial Maximum, Heinrich Stadial 1, and the mid-Holocene

Cited by 289 publications

References 60 publications

Effects of Arctic geoengineering on precipitation in the tropical monsoon regions

Effects of Arctic geoengineering on precipitation in the tropical monsoon regions

Millennial meridional dynamics of the Indo-Pacific Warm Pool during the last termination

Precipitation variability within the West Pacific Warm Pool over the past 120 ka: Evidence from the Davao Gulf, southern Philippines

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