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Linear Relation Between Shifting ITCZ and Dust Hemispheric Asymmetry
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2020
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Source: Geophysical Research Letters, 47(22)
[PDF-1.09 MB]
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Journal Title:Geophysical Research Letters
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Description:Mineral dust is emitted primarily from arid regions, which may shrink or expand in one or both hemispheres, producing a complex and asymmetric pattern of radiative forcing that varies on interannual to millennial timescales. We assess the impact of hemispheric dust asymmetry on tropical precipitation.Using the Geophysical Fluid Dynamics Laboratory (GFDL) coupled climate model CM3 to simulate dust emission, we vary source strength in each hemisphere individually. Hemispherically asymmetric dust emission produces asymmetric dust load and radiative forcing. We find that the Intertropical Convergence Zone (ITCZ) shifts away from the hemisphere with enhanced dust load in response to the forcing asymmetry. We find signi ficant linear relationships between the hemispheric imbalance and the latitude
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Source:Geophysical Research Letters, 47(22)
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DOI:
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ISSN:0094-8276;1944-8007;
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Rights Information:Other
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