The effect of global climate change on the regions of tropical convection in CSM1

Jan F. Dutton; Chris J. Poulsen; Jenni L. Evans

doi:10.1029/2000GL011542

The effect of global climate change on the regions of tropical convection in CSM1

Jan F. Dutton, Chris J. Poulsen, Jenni L. Evans

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

The impact of enhanced carbon dioxide concentrations on deep tropical convection (DTC) is explored using (he National Center for Atmospheric Research (NCAR) Climate System Model (CSM1) model. A 134-year simulation in which CO₂ concentrations increase 1 % year^-1 is analyzed. With approximately present-day CO₂ concentrations (367 ppmv) the CSM1 simulation captures the observed relationship between outgoing longwave radiation (OLR) and sea-surface temperature (SST) in the tropics. The temperature threshold for deep convection in the model is approximately 24.75° C. As CO₂ concentrations increase, the simulated threshold temperature for tropical convection progressively increases to -25.55° C and 26.55° C at 2×CO₂ (year 80) and 3.4×CO₂ (year 133). The fully coupled climate model response to increased CO₂ concentrations implies that the expansion of the 26° C isotherm, the present-day observed threshold, will not yield an expansion of the regions of DTC.

Original language	English (US)
Pages (from-to)	3049-3052
Number of pages	4
Journal	Geophysical Research Letters
Volume	27
Issue number	19
DOIs	https://doi.org/10.1029/2000GL011542
State	Published - 2000

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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10.1029/2000GL011542

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title = "The effect of global climate change on the regions of tropical convection in CSM1",

abstract = "The impact of enhanced carbon dioxide concentrations on deep tropical convection (DTC) is explored using (he National Center for Atmospheric Research (NCAR) Climate System Model (CSM1) model. A 134-year simulation in which CO2 concentrations increase 1 % year-1 is analyzed. With approximately present-day CO2 concentrations (367 ppmv) the CSM1 simulation captures the observed relationship between outgoing longwave radiation (OLR) and sea-surface temperature (SST) in the tropics. The temperature threshold for deep convection in the model is approximately 24.75° C. As CO2 concentrations increase, the simulated threshold temperature for tropical convection progressively increases to -25.55° C and 26.55° C at 2×CO2 (year 80) and 3.4×CO2 (year 133). The fully coupled climate model response to increased CO2 concentrations implies that the expansion of the 26° C isotherm, the present-day observed threshold, will not yield an expansion of the regions of DTC.",

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TY - JOUR

T1 - The effect of global climate change on the regions of tropical convection in CSM1

AU - Dutton, Jan F.

AU - Poulsen, Chris J.

AU - Evans, Jenni L.

PY - 2000

Y1 - 2000

N2 - The impact of enhanced carbon dioxide concentrations on deep tropical convection (DTC) is explored using (he National Center for Atmospheric Research (NCAR) Climate System Model (CSM1) model. A 134-year simulation in which CO2 concentrations increase 1 % year-1 is analyzed. With approximately present-day CO2 concentrations (367 ppmv) the CSM1 simulation captures the observed relationship between outgoing longwave radiation (OLR) and sea-surface temperature (SST) in the tropics. The temperature threshold for deep convection in the model is approximately 24.75° C. As CO2 concentrations increase, the simulated threshold temperature for tropical convection progressively increases to -25.55° C and 26.55° C at 2×CO2 (year 80) and 3.4×CO2 (year 133). The fully coupled climate model response to increased CO2 concentrations implies that the expansion of the 26° C isotherm, the present-day observed threshold, will not yield an expansion of the regions of DTC.

AB - The impact of enhanced carbon dioxide concentrations on deep tropical convection (DTC) is explored using (he National Center for Atmospheric Research (NCAR) Climate System Model (CSM1) model. A 134-year simulation in which CO2 concentrations increase 1 % year-1 is analyzed. With approximately present-day CO2 concentrations (367 ppmv) the CSM1 simulation captures the observed relationship between outgoing longwave radiation (OLR) and sea-surface temperature (SST) in the tropics. The temperature threshold for deep convection in the model is approximately 24.75° C. As CO2 concentrations increase, the simulated threshold temperature for tropical convection progressively increases to -25.55° C and 26.55° C at 2×CO2 (year 80) and 3.4×CO2 (year 133). The fully coupled climate model response to increased CO2 concentrations implies that the expansion of the 26° C isotherm, the present-day observed threshold, will not yield an expansion of the regions of DTC.

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DO - 10.1029/2000GL011542

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JO - Geophysical Research Letters

JF - Geophysical Research Letters

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ER -

The effect of global climate change on the regions of tropical convection in CSM1

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