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CO2 semiannual oscillation in the middle troposphere and at the surface

Identifieur interne : 000499 ( Main/Exploration ); précédent : 000498; suivant : 000500

CO2 semiannual oscillation in the middle troposphere and at the surface

Auteurs : XUN JIANG [États-Unis] ; Moustafa T. Chahine [États-Unis] ; QINBIN LI [États-Unis] ; MAOCHANG LIANG [Taïwan] ; Edward T. Olsen [États-Unis] ; Luke L. Chen [États-Unis] ; JINGQIAN WANG [États-Unis] ; Yuk L. Yung [États-Unis]

Source :

RBID : Pascal:12-0426387

Mots-clés :

Abstract

Using in situ measurements, we find a semiannual oscillation (SAO) in the midtropospheric and surface CO2. Chemistry transport models (2-D Caltech/JPL model, 3-D GEOS-Chem, and 3-D MOZART-2) are used to investigate possible sources for the SAO signal in the midtropospheric and surface CO2. From model sensitivity studies, it is revealed that the SAO signal in the midtropospheric CO2 originates mainly from surface CO2 with a small contribution from transport fields. It is also found that the source for the SAO signal in surface CO2 is mostly related to the CO2 exchange between the biosphere and the atmosphere. By comparing model CO2 with in situ CO2 measurements at the surface, we find that models are able to capture both annual and semiannual cycles well at the surface. Model simulations of the annual and semiannual cycles of CO2 in the tropical middle troposphere agree reasonably well with aircraft measurements.


Affiliations:


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Le document en format XML

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semiannual oscillation in the middle troposphere and at the surface</title>
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semiannual oscillation in the middle troposphere and at the surface</title>
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<front>
<div type="abstract" xml:lang="en">Using in situ measurements, we find a semiannual oscillation (SAO) in the midtropospheric and surface CO
<sub>2</sub>
. Chemistry transport models (2-D Caltech/JPL model, 3-D GEOS-Chem, and 3-D MOZART-2) are used to investigate possible sources for the SAO signal in the midtropospheric and surface CO
<sub>2</sub>
. From model sensitivity studies, it is revealed that the SAO signal in the midtropospheric CO
<sub>2</sub>
originates mainly from surface CO
<sub>2</sub>
with a small contribution from transport fields. It is also found that the source for the SAO signal in surface CO
<sub>2</sub>
is mostly related to the CO
<sub>2</sub>
exchange between the biosphere and the atmosphere. By comparing model CO
<sub>2</sub>
with in situ CO
<sub>2</sub>
measurements at the surface, we find that models are able to capture both annual and semiannual cycles well at the surface. Model simulations of the annual and semiannual cycles of CO
<sub>2</sub>
in the tropical middle troposphere agree reasonably well with aircraft measurements.</div>
</front>
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