Seasonal cycles of O-3, CO, and convective outflow at the tropical tropopause

Ian Folkins; P. Bernath; C. Boone; G. Lesins; N. Livesey; A. M. Thompson; K. Walker; J. C. Witte

doi:10.1029/2006GL026602

Seasonal cycles of O-3, CO, and convective outflow at the tropical tropopause

Ian Folkins, P. Bernath, C. Boone, G. Lesins, N. Livesey, A. M. Thompson, K. Walker, J. C. Witte

Chemistry

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

Abstract

Measurements from the SHADOZ ozonesonde network and Aura MLS are used to show that there are seasonal cycles in ozone (O-3) and carbon monoxide (CO) at the tropical tropopause ( similar to 17 km). A simple model, driven by cloud free radiative mass fluxes, is used to investigate the origin of these seasonal cycles. The seasonal cycle in O-3 is due to seasonal changes in upwelling and high altitude convective outflow. The seasonal cycle in CO at 100 hPa is influenced by both seasonal changes in dynamics and seasonal changes in CO at lower altitudes. The age of air at 17 km varies from 40 days during NH winter to 70 days during NH summer. The seasonal cycle in clear sky radiative heating at the tropical tropopause is mainly due to seasonal cycles in O-3 and temperature. The seasonal cycle in O-3 can be expected to amplify the seasonal cycle in cold point temperature.

Original language	English
Pages (from-to)	-
Number of pages	5
Journal	Geophysical Research Letters
Volume	33
Issue number	16
DOIs	https://doi.org/10.1029/2006GL026602
Publication status	Published - 19 Aug 2006

Keywords

UPPER TROPOSPHERE
OZONE CLIMATOLOGY
DEEP CONVECTION
WATER-VAPOR
ART.
OZONESONDES
SPECTROMETER
VARIABILITY
BALANCE

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10.1029/2006GL026602

Cite this

@article{e5778dc57f9645b29a07034f8bb504e4,

title = "Seasonal cycles of O-3, CO, and convective outflow at the tropical tropopause",

abstract = "Measurements from the SHADOZ ozonesonde network and Aura MLS are used to show that there are seasonal cycles in ozone (O-3) and carbon monoxide (CO) at the tropical tropopause ( similar to 17 km). A simple model, driven by cloud free radiative mass fluxes, is used to investigate the origin of these seasonal cycles. The seasonal cycle in O-3 is due to seasonal changes in upwelling and high altitude convective outflow. The seasonal cycle in CO at 100 hPa is influenced by both seasonal changes in dynamics and seasonal changes in CO at lower altitudes. The age of air at 17 km varies from 40 days during NH winter to 70 days during NH summer. The seasonal cycle in clear sky radiative heating at the tropical tropopause is mainly due to seasonal cycles in O-3 and temperature. The seasonal cycle in O-3 can be expected to amplify the seasonal cycle in cold point temperature.",

keywords = "UPPER TROPOSPHERE, OZONE CLIMATOLOGY, DEEP CONVECTION, WATER-VAPOR, ART., OZONESONDES, SPECTROMETER, VARIABILITY, BALANCE",

author = "Ian Folkins and P. Bernath and C. Boone and G. Lesins and N. Livesey and Thompson, {A. M.} and K. Walker and Witte, {J. C.}",

year = "2006",

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journal = "Geophysical Research Letters",

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TY - JOUR

T1 - Seasonal cycles of O-3, CO, and convective outflow at the tropical tropopause

AU - Folkins, Ian

AU - Bernath, P.

AU - Boone, C.

AU - Lesins, G.

AU - Livesey, N.

AU - Thompson, A. M.

AU - Walker, K.

AU - Witte, J. C.

PY - 2006/8/19

Y1 - 2006/8/19

N2 - Measurements from the SHADOZ ozonesonde network and Aura MLS are used to show that there are seasonal cycles in ozone (O-3) and carbon monoxide (CO) at the tropical tropopause ( similar to 17 km). A simple model, driven by cloud free radiative mass fluxes, is used to investigate the origin of these seasonal cycles. The seasonal cycle in O-3 is due to seasonal changes in upwelling and high altitude convective outflow. The seasonal cycle in CO at 100 hPa is influenced by both seasonal changes in dynamics and seasonal changes in CO at lower altitudes. The age of air at 17 km varies from 40 days during NH winter to 70 days during NH summer. The seasonal cycle in clear sky radiative heating at the tropical tropopause is mainly due to seasonal cycles in O-3 and temperature. The seasonal cycle in O-3 can be expected to amplify the seasonal cycle in cold point temperature.

AB - Measurements from the SHADOZ ozonesonde network and Aura MLS are used to show that there are seasonal cycles in ozone (O-3) and carbon monoxide (CO) at the tropical tropopause ( similar to 17 km). A simple model, driven by cloud free radiative mass fluxes, is used to investigate the origin of these seasonal cycles. The seasonal cycle in O-3 is due to seasonal changes in upwelling and high altitude convective outflow. The seasonal cycle in CO at 100 hPa is influenced by both seasonal changes in dynamics and seasonal changes in CO at lower altitudes. The age of air at 17 km varies from 40 days during NH winter to 70 days during NH summer. The seasonal cycle in clear sky radiative heating at the tropical tropopause is mainly due to seasonal cycles in O-3 and temperature. The seasonal cycle in O-3 can be expected to amplify the seasonal cycle in cold point temperature.

KW - UPPER TROPOSPHERE

KW - OZONE CLIMATOLOGY

KW - DEEP CONVECTION

KW - WATER-VAPOR

KW - ART.

KW - OZONESONDES

KW - SPECTROMETER

KW - VARIABILITY

KW - BALANCE

U2 - 10.1029/2006GL026602

DO - 10.1029/2006GL026602

M3 - Article

SN - 0094-8276

VL - 33

SP - -

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 16

ER -