Changes in upper stratospheric CH4 and NO2 as measured by HALOE and implications for changes in transport

G. E. Nedoluha; D. E. Siskind; J. T. Bacmeister; R. M. Bevilacqua; J. M. Russell

doi:10.1029/98GL00489

Changes in upper stratospheric CH₄ and NO₂ as measured by HALOE and implications for changes in transport

G. E. Nedoluha, D. E. Siskind, J. T. Bacmeister, R. M. Bevilacqua, J. M. Russell

Atmospheric Modeling and Predictability

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Abstract

Measurements from HALOE indicate that there has been a significant decrease in CH₄ in the middle to upper stratosphere from 1991-1997. Two dimensional model calculations suggest that a decrease in the tropical upwelling is the most plausible explanation for the CH₄ decrease. The changes in CH₄ resulting from solar cycle variations or changes in tropospheric CH₄ and CFC emission rates are shown to be much smaller than the measured variations from ∼35-65 km. The HALOE measurements of NO₂ in the lower stratosphere near the equator also show an increase which is consistent with a reduction in the upward transport rate. Above ∼40 km the NO₂ measurements appear to be consistent with the net effect of opposing solar and dynamical trends.

Original language	English
Pages (from-to)	987-990
Number of pages	4
Journal	Geophysical Research Letters
Volume	25
Issue number	7
DOIs	https://doi.org/10.1029/98GL00489
State	Published - Apr 1 1998

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title = "Changes in upper stratospheric CH4 and NO2 as measured by HALOE and implications for changes in transport",

abstract = "Measurements from HALOE indicate that there has been a significant decrease in CH4 in the middle to upper stratosphere from 1991-1997. Two dimensional model calculations suggest that a decrease in the tropical upwelling is the most plausible explanation for the CH4 decrease. The changes in CH4 resulting from solar cycle variations or changes in tropospheric CH4 and CFC emission rates are shown to be much smaller than the measured variations from ∼35-65 km. The HALOE measurements of NO2 in the lower stratosphere near the equator also show an increase which is consistent with a reduction in the upward transport rate. Above ∼40 km the NO2 measurements appear to be consistent with the net effect of opposing solar and dynamical trends.",

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T1 - Changes in upper stratospheric CH4 and NO2 as measured by HALOE and implications for changes in transport

AU - Nedoluha, G. E.

AU - Siskind, D. E.

AU - Bacmeister, J. T.

AU - Bevilacqua, R. M.

AU - Russell, J. M.

PY - 1998/4/1

Y1 - 1998/4/1

N2 - Measurements from HALOE indicate that there has been a significant decrease in CH4 in the middle to upper stratosphere from 1991-1997. Two dimensional model calculations suggest that a decrease in the tropical upwelling is the most plausible explanation for the CH4 decrease. The changes in CH4 resulting from solar cycle variations or changes in tropospheric CH4 and CFC emission rates are shown to be much smaller than the measured variations from ∼35-65 km. The HALOE measurements of NO2 in the lower stratosphere near the equator also show an increase which is consistent with a reduction in the upward transport rate. Above ∼40 km the NO2 measurements appear to be consistent with the net effect of opposing solar and dynamical trends.

AB - Measurements from HALOE indicate that there has been a significant decrease in CH4 in the middle to upper stratosphere from 1991-1997. Two dimensional model calculations suggest that a decrease in the tropical upwelling is the most plausible explanation for the CH4 decrease. The changes in CH4 resulting from solar cycle variations or changes in tropospheric CH4 and CFC emission rates are shown to be much smaller than the measured variations from ∼35-65 km. The HALOE measurements of NO2 in the lower stratosphere near the equator also show an increase which is consistent with a reduction in the upward transport rate. Above ∼40 km the NO2 measurements appear to be consistent with the net effect of opposing solar and dynamical trends.

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M3 - Article

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SN - 0094-8276

VL - 25

SP - 987

EP - 990

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 7

ER -

Changes in upper stratospheric CH₄ and NO₂ as measured by HALOE and implications for changes in transport

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