The influence of tropospheric biennial oscillation on mid-tropospheric CO₂

Abstract

[1] Mid-tropospheric CO 2 retrieved from the Atmospheric Infrared Sounder (AIRS) was used to investigate CO 2 interannual variability over the Indo-Pacific region. A signal with periodicity around two years was found for the AIRS mid-tropospheric CO 2 for the first time, which is related to the Tropospheric Biennial Oscillation (TBO) associated with the strength of the monsoon. During a strong (weak) monsoon year, the Western Walker Circulation is strong (weak), resulting in enhanced (diminished) CO 2 transport from the surface to the mid-troposphere. As a result, there are positive (negative) CO 2 anomalies at mid-troposphere over the Indo-Pacific region. We simulated the influence of the TBO on the mid-tropospheric CO 2 over the IndoPacific region using the MOZART-2 model, and results were consistent with observations, although we found the TBO signal in the model CO 2 is to be smaller than that in the AIRS observations. Citation: Wang, J., X. Jiang, M. T.

Influence of El Niño on Midtropospheric CO2 from Atmospheric Infrared Sounder and Model

“…Variations of CO 2 seasonal cycle amplitudes are closely related to carbon exchange with the biosphere (Pearman andHyson 1980, 1981;Cleveland et al 1983;Bacastow et al 1985;Keeling et al 1996;Buermann et al 2007). Combining satellite/in situ observations and model simulations, we found that there are Madden-Julian oscillation (MJO), semiannual oscillation (SAO), and tropospheric biennial oscillation (TBO) signals in midtropospheric CO 2 Jiang et al 2012;Wang et al 2011). Combining satellite/in situ observations and model simulations, we found that there are Madden-Julian oscillation (MJO), semiannual oscillation (SAO), and tropospheric biennial oscillation (TBO) signals in midtropospheric CO 2 Jiang et al 2012;Wang et al 2011).…”

Multiyear average characteristics of CO2 variations in the free atmosphere over Colorado (40° N, 104° W)

“…Phases of 24-month component in Table 1 correspond to its maxima in winters of odd years and minima in winters of even years at altitudes 4e8 km. This component may be connected with quasi-biannual oscillations frequently observed in variations of other atmospheric parameters (Wang et al, 2011). Kashin et al (2008) made spectral analysis of the data of about 30-year long ground-based spectroscopic CO 2 observations at IssykKul Monitoring Station (see ISK 242 N00 in WMO WDCGG, 2006) in Kyrgyzstan, 42 N, 77 E, 1650 masl.…”

An Intraseasonal Variability in CO2 Over the Arctic Induced by the Madden‐Julian Oscillation

“…Continuous measurements from space (Buchwitz et al, 2005;Chahine et al, 2008;Crevoisier et al, 2009;Eldering et al, 2017;Kuze et al, 2009;Nassar et al, 2011) and ground (Nevison et al, 2008;Newman et al, 2016;Wong et al, 2015;Wunch et al, 2011) have been devoted to monitoring atmospheric CO 2 variability on daily to monthly basis. With midtropospheric CO 2 observations from NASA's spaceborne Atmospheric Infrared Sounder (AIRS) becoming available in the last decade (Chahine et al, 2008), several short-term (intraseasonal to interannual) natural variability have been unveiled, including the tropical intraseasonal variability (with peak-to-peak amplitude~1.5 ppm) related to the Madden-Julian oscillation (MJO) (Li et al, 2010), the semiannual variability (~3 ppm) (Jiang et al, 2012), the biennial variability (~1.0 ppm) related to Asian monsoons (Wang et al, 2011), interannual variability (2-3 ppm) related to the El Niño-Southern Oscillation (Jiang et al, 2010), and polar variability related to the Arctic oscillation and stratospheric sudden warming (Jiang et al, 2010(Jiang et al, , 2013.…”