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Open AccessArticle

Biases of Global Tropopause Altitude Products in Reanalyses and Implications for Estimates of Tropospheric Column Ozone

1
School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China
2
Department of Geography and Planning, University of Toronto, Toronto, ON M5S 3G3, Canada
3
Air Quality Research Division, Environment and Climate Change Canada, Downsview, ON M3H 5T4, Canada
4
School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou 221116, China
*
Author to whom correspondence should be addressed.
Academic Editors: Chunlei Liu, Todd R. Jones and Bernhard Rappenglueck
Atmosphere 2021, 12(4), 417; https://doi.org/10.3390/atmos12040417
Received: 3 February 2021 / Revised: 9 March 2021 / Accepted: 17 March 2021 / Published: 24 March 2021
(This article belongs to the Special Issue Climate Reanalysis)
Accuracy of global tropopause altitude products from reanalyses is important to applications of the products, including the derivation of tropospheric column ozone (TCO). Here, monthly biases in lapse-rate tropopause pressure (PLRT) in two reanalyses, NCEP/NCAR and MERRA-2, and associated implications for estimating TCO are examined, based on global radiosonde observations over 1980–2017 at 689 stations. Our analysis suggests that the global mean PLRT is underestimated by −2.3 hPa in NCEP/NCAR and by −0.9 hPa in MERRA-2, mainly attributable to large negative biases around the subtropics (~20°–50°) in both hemispheres, with generally positive biases at other latitudes. Overall, NCEP/NCAR outperforms MERRA-2 in the Northern Hemisphere but underperforms MERRA-2 in the Southern Hemisphere. PLRT biases in the two reanalyses vary more evidently with latitude than with longitude. From winter to summer, the peaks of negative PLRT biases around the subtropics shift poleward by ~10°. Approximately, 70% of the reanalysis PLRT biases are within −10–10 hPa. Consequently, a negative (positive) PLRT bias induces a positive (negative) TCO bias. In absolute magnitude, the mean ozonesonde TCO bias attributable to PLRT biases is ~0.2, ~0.8 and ~1.2 Dobson Units (DU) if a PLRT bias is within 0–5, 10–15, and 10–15 hPa. Using a global ozone climatology, we estimate that the global mean bias in TCO induced by the PLRT biases in both reanalyses is positive, being 0.64 DU (or 2.2%) for NCEP/NCAR and 0.28 DU (or 1.1%) for MERRA-2. View Full-Text
Keywords: tropopause; reanalysis; ozone tropopause; reanalysis; ozone
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MDPI and ACS Style

Meng, L.; Liu, J.; Tarasick, D.W.; Li, Y. Biases of Global Tropopause Altitude Products in Reanalyses and Implications for Estimates of Tropospheric Column Ozone. Atmosphere 2021, 12, 417. https://doi.org/10.3390/atmos12040417

AMA Style

Meng L, Liu J, Tarasick DW, Li Y. Biases of Global Tropopause Altitude Products in Reanalyses and Implications for Estimates of Tropospheric Column Ozone. Atmosphere. 2021; 12(4):417. https://doi.org/10.3390/atmos12040417

Chicago/Turabian Style

Meng, Lingyun; Liu, Jane; Tarasick, David W.; Li, Yingjie. 2021. "Biases of Global Tropopause Altitude Products in Reanalyses and Implications for Estimates of Tropospheric Column Ozone" Atmosphere 12, no. 4: 417. https://doi.org/10.3390/atmos12040417

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