Pushker Kharecha - NASA Goddard Institute for Space Studies and Columbia University Earth Institute

Pushker Kharecha
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Pushker Kharecha
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NASA Goddard Institute for Space Studies and Columbia University Earth Institute
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Physics - Atmospheric and Oceanic Physics (5)

Publications Authored By Pushker Kharecha

Global temperature is a useful metric for global climate that helps define the potential amplitude of slow climate feedbacks, such as ice sheet melt and sea level rise. Annual temperature in 2016, enhanced by the 2015-2016 El Nino, was +1.3 degC relative to 1880-1920. Read More

We use numerical climate simulations, paleoclimate data, and modern observations to study the effect of growing ice melt from Antarctica and Greenland. Meltwater tends to stabilize the ocean column, inducing amplifying feedbacks that increase subsurface ocean warming and ice shelf melting. Cold meltwater and induced dynamical effects cause ocean surface cooling in the Southern Ocean and North Atlantic, thus increasing Earth's energy imbalance and heat flux into most of the global ocean's surface. Read More

2012Nov
Affiliations: 1NASA Goddard Institute for Space Studies and Columbia University Earth Institute, 2NASA Goddard Institute for Space Studies and Columbia University Earth Institute, 3NASA Goddard Institute for Space Studies and Columbia University Earth Institute, 4NASA Goddard Institute for Space Studies and Columbia University Earth Institute

Cenozoic temperature, sea level and CO2 co-variations provide insights into climate sensitivity to external forcings and sea level sensitivity to climate change. Climate sensitivity depends on the initial climate state, but potentially can be accurately inferred from precise paleoclimate data. Pleistocene climate oscillations yield a fast-feedback climate sensitivity 3 +/- 1{\deg}C for 4 W/m2 CO2 forcing if Holocene warming relative to the Last Glacial Maximum (LGM) is used as calibration, but the error (uncertainty) is substantial and partly subjective because of poorly defined LGM global temperature and possible human influences in the Holocene. Read More

Global warming due to human-made gases, mainly CO2, is already 0.8{\deg}C and deleterious climate impacts are growing worldwide. More warming is 'in the pipeline' because Earth is out of energy balance, with absorbed solar energy exceeding planetary heat radiation. Read More

2011May
Affiliations: 1NASA Goddard Institute for Space Studies and Columbia University Earth Institute, 2NASA Goddard Institute for Space Studies and Columbia University Earth Institute, 3NASA Goddard Institute for Space Studies and Columbia University Earth Institute, 4Centre National de la Recherche Scientifique

Improving observations of ocean heat content show that Earth is absorbing more energy from the sun than it is radiating to space as heat, even during the recent solar minimum. The inferred planetary energy imbalance, 0.59 \pm 0. Read More