Interhemispheric bias in earth's climate response to orbital forcing

Roychowdhury, Rajarshi; DeConto, Robert M.

doi:10.5194/cp-2015-156

Cited by 3 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, the MIS31 climate experiences weaker trade winds, which is consistent with Martínez-Garcia et al (2010). The ODP sites in the SH also corroborate previous results showing small differences between the model and reconstructions (Table 2; Scherer et al, 2008;Voelker et al, 2015;Naish et al, 2009;Russon et al, 2011;Crundwell et al, 2008;Martínez-Garcia et al, 2010).…”

Section: The Mis31 Climatesupporting

confidence: 88%

“…In the equatorial regions, the model performs well compared to reconstructed temperatures with departures of up to ±1 • C (Herbert et al, 2010b;Li et al, 2011;Dyez and Ravelo, 2014;Medina-Elizalde et al, 2008;Herbert et al, 2010c;Russon et al, 2011). Comparing ODP sites 849, 847, 846, and 871 in the equatorial Pacific (Table 2), the east-west SST gradient may be identified as supported by changes in the zonal circulation.…”

Section: The Mis31 Climatementioning

confidence: 85%

“…Recent paleoreconstructions and climate modeling experiments have attempted to disentangle the influence of dominant forcing on past climates from orbital configurations (Yin, 2013;Erb et al, 2015) to the El Niño Southern Oscillation (ENSO) and ice sheet variability (Russon et al, 2011;DeConto et al, 2012). However, other issues, like air-sea coupling and its impact on atmospheric and oceanic variability (Knutti et al, 2004;Bush and Philander, 1998), require additional scrutiny.…”

Section: Introductionmentioning

confidence: 99%

“…Published by Copernicus Publications on behalf of the European Geosciences Union. Others have taken advantage of simplified climate models using an atmospheric general circulation model (GCM) coupled to a slab mixed-layer ocean model (Lunt et al, 2017;Coletti et al, 2015;Roychowdhury and DeConto, 2016). Though valid, this modeling approach reduces oceanatmosphere feedbacks that are crucial for the reorganization of atmospheric flow on long timescales.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Oceanic response to changes in the WAIS and astronomical forcing during the MIS31 superinterglacial

Justino¹,

Lindemann²,

Kucharski³

et al. 2016

Preprint

View full text Add to dashboard Cite

Abstract. Marine Isotope Stage 31 (MIS31, between 1085 ka and 1055 ka) was characterized by higher extratropical air temperatures and a substantial recession of polar glaciers compared to today. Paleoreconstructions and modeling efforts have increased the understanding of MIS31 interval, but questions remain regarding the role of the Atlantic and Pacific Oceans in modifying climate anomalies associated with the variations in Earth’s orbital parameters. Based on multi-century coupled climate simulations, it is shown that under the astronomical configuration of the MIS31 and forced by modified West Antarctic Ice Sheet (WAIS) topography, there exists a substantial increase in the thermohaline flux and its associated northward oceanic heat transport (OHT) in both the Atlantic and Pacific Oceans. In the Atlantic, these changes are driven by enhanced oceanic heat loss to the atmosphere and increased water density. In the Pacific, anomalous wind-driven circulation in concert with stronger meridional overturning circulation results in greater northward OHT that contributes up to 85 % of the global OHT anomalies, adding to an overall reduction in sea ice in the Northern Hemisphere (NH) due to Earth’s astronomical configuration at the time. Sea-ice changes in the Southern Hemisphere (SH) are highlighted by decreased (increased) cover in Ross (Weddell) Sea.

show abstract

Section: The Mis31 Climatesupporting

confidence: 88%

Section: The Mis31 Climatementioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oceanic response to changes in the WAIS and astronomical forcing during the MIS31 superinterglacial

Justino¹,

Lindemann²,

Kucharski³

et al. 2016

Preprint

View full text Add to dashboard Cite

show abstract

“…Others have taken advantage of simplified climate models using an atmospheric general circulation model (GCM) coupled to a slab mixed-layer ocean model (Lunt et al, 2017;Coletti et al, 2015;Roychowdhury and DeConto, 2016). Though valid, this modeling approach reduces oceanatmosphere feedbacks that are crucial for the reorganization of atmospheric flow on long timescales.…”

Section: Introductionmentioning

confidence: 99%

Oceanic response to changes in the WAIS and astronomical forcing during the MIS31 superinterglacial

Justino¹,

Lindemann²,

Kucharski

et al. 2017

Clim. Past

View full text Add to dashboard Cite

Abstract. Marine Isotope Stage 31 (MIS31, between 1085and 1055 ka) was characterized by higher extratropical air temperatures and a substantial recession of polar glaciers compared to today. Paleoreconstructions and model simulations have increased the understanding of the MIS31 interval, but questions remain regarding the role of the Atlantic and Pacific oceans in modifying the climate associated with the variations in Earth's orbital parameters. Multi-century coupled climate simulations, with the astronomical configuration of the MIS31 and modified West Antarctic Ice Sheet (WAIS) topography, show an increase in the thermohaline flux and northward oceanic heat transport (OHT) in the Pacific Ocean. These oceanic changes are driven by anomalous atmospheric circulation and increased surface salinity in concert with a stronger meridional overturning circulation (MOC). The intensified northward OHT is responsible for up to 85 % of the global OHT anomalies and contributes to the overall reduction in sea ice in the Northern Hemisphere (NH) due to Earth's astronomical configuration. The relative contributions of the Atlantic Ocean to global OHT and MOC anomalies are minor compared to those of the Pacific. However, sea ice changes are remarkable, highlighted by decreased (increased) cover in the Ross (Weddell) Sea but widespread reductions in sea ice across the NH.

show abstract

Reply to both Reviewers

Justino¹

2017

View full text Add to dashboard Cite

Marine Isotope Stage 31 (MIS31, between 1085 and 1055 ka) was characterized by higher extratropical air temperatures and a substantial recession of polar glaciers compared to today. Paleoreconstructions and model simulations have increased the understanding of the MIS31 interval, but questions remain regarding the role of the Atlantic and Pacific oceans in modifying the climate associated with the variations in Earth's orbital parameters. Multi-century coupled climate simulations, with the astronomical configuration of the MIS31 and modified West Antarctic Ice Sheet (WAIS) topography, show an increase in the thermohaline flux and northward oceanic heat transport (OHT) in the Pacific Ocean. These oceanic changes are driven by anomalous atmospheric circulation and increased surface salinity in concert with a stronger meridional overturning circulation (MOC). The intensified northward OHT is responsible for up to 85 % of the global OHT anomalies and contributes to the overall reduction in sea ice in the Northern Hemisphere (NH) due to Earth's astronomical configuration. The relative contributions of the Atlantic Ocean to global OHT and MOC anomalies are minor compared to those of the Pacific. However, sea ice changes are remarkable, highlighted by decreased (increased) cover in the Ross (Weddell) Sea but widespread reductions in sea ice across the NH.

show abstract

Interhemispheric bias in earth's climate response to orbital forcing

Cited by 3 publications

References 17 publications

Oceanic response to changes in the WAIS and astronomical forcing during the MIS31 superinterglacial

Oceanic response to changes in the WAIS and astronomical forcing during the MIS31 superinterglacial

Oceanic response to changes in the WAIS and astronomical forcing during the MIS31 superinterglacial

Reply to both Reviewers

Contact Info

Product

Resources

About