letters to the editor

letters to the editor Greenhouse warming and study convective systems in the tropics, that this mean the tropical water budget picture is incomplete. Tropical convective mesosystems (the so-called "cloud clusters") go through a complex life cycle. They start with a single cell circulation from low to high In "Some Coolness Concerning Global Warming" (March levels, associated with the growth of cumulonimbi, but then 1990), Lindzen has raised an important climate issue: how they develop a double cell circulation with ascent above the well do we understand the water budget of the tropics? freezing level in a large mesoscale anvil, and with descent Water vapor is the major absorber in the infrared contribut- underneath the anvil. This double cell structure is driven by ing to the greenhouse effect. It is not always considered a condensation and freezing above, and melting and evapora- "greenhouse gas" because its concentration is controlled on tion of falling precipitation below the freezing level (which timescales of order a week by convective, radiative and in the tropics is near 550 mb in the middle troposphere). The decay of these thick upper-level anvil ice clouds (between dynamical processes in the atmosphere; while the other 550 and 150 mb) leaves large amounts http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of the American Meteorological Society American Meteorological Society

letters to the editor

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0477
D.O.I.
10.1175/1520-0477-71.10.1464
Publisher site
See Article on Publisher Site

Abstract

Greenhouse warming and study convective systems in the tropics, that this mean the tropical water budget picture is incomplete. Tropical convective mesosystems (the so-called "cloud clusters") go through a complex life cycle. They start with a single cell circulation from low to high In "Some Coolness Concerning Global Warming" (March levels, associated with the growth of cumulonimbi, but then 1990), Lindzen has raised an important climate issue: how they develop a double cell circulation with ascent above the well do we understand the water budget of the tropics? freezing level in a large mesoscale anvil, and with descent Water vapor is the major absorber in the infrared contribut- underneath the anvil. This double cell structure is driven by ing to the greenhouse effect. It is not always considered a condensation and freezing above, and melting and evapora- "greenhouse gas" because its concentration is controlled on tion of falling precipitation below the freezing level (which timescales of order a week by convective, radiative and in the tropics is near 550 mb in the middle troposphere). The decay of these thick upper-level anvil ice clouds (between dynamical processes in the atmosphere; while the other 550 and 150 mb) leaves large amounts

Journal

Bulletin of the American Meteorological SocietyAmerican Meteorological Society

Published: Oct 1, 1990

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