Land-atmosphere interaction and radiative-convective equilibrium

Thesis: Ph. D. in Climate Physics and Chemistry, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014.

Bibliographic Details
Main Author: Cronin, Timothy (Timothy Wallace)
Other Authors: Kerry A. Emanuel.
Format: Thesis
Language:eng
Published: Massachusetts Institute of Technology 2014
Subjects:
Online Access:http://hdl.handle.net/1721.1/90605
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author Cronin, Timothy (Timothy Wallace)
author2 Kerry A. Emanuel.
author_facet Kerry A. Emanuel.
Cronin, Timothy (Timothy Wallace)
author_sort Cronin, Timothy (Timothy Wallace)
collection MIT
description Thesis: Ph. D. in Climate Physics and Chemistry, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014.
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spelling mit-1721.1/906052019-04-10T17:47:01Z Land-atmosphere interaction and radiative-convective equilibrium Cronin, Timothy (Timothy Wallace) Kerry A. Emanuel. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Earth, Atmospheric, and Planetary Sciences. Thesis: Ph. D. in Climate Physics and Chemistry, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014. This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. Cataloged from student-submitted PDF version of thesis. Includes bibliographical references (pages 161-171). I present work on several topics related to land-atmosphere interaction and radiative-convective equilibrium: the first two research chapters invoke ideas related to land-atmosphere interaction to better understand radiative-convective equilibrium; the last two research chapters use the framework of radiative-convective equilibrium to better understand land-atmosphere interaction. First, I calculate how averaging the incident solar radiation can lead to biases in idealized climate models. I derive an expression for the absorption-weighted solar zenith angle, which minimizes the bias in mean absorbed shortwave radiation, and I find that it is closely matched by the insolation-weighted zenith angle. Common use of daytime-weighted zenith angle likely leads to high biases in albedo by ~3%. Second, I explore the time scales of approach to radiative-convective equilibrium with both a simple linearized two-variable model, and a single-column model with full physics. I show that there is a long time scale of approach to radiative-convective equilibrium that is order hundreds of days even when the surface heat capacity vanishes. The impact of water vapor on the effective atmospheric heat capacity can more than double this time scale for warm temperatures and low surface heat capacities. Third, I develop an analytic theory for the sensitivity of near-surface temperature to properties of the land surface. I show that the theory compares well against a simple numerical model of the coupled boundary layer-surface system, as well as a more complex two-column model, and discuss application of the theory to questions of how changes in land use or ecosystem function may affect climate change. Finally, I find that the diurnal cycle of convection is important for the spatial distribution of rainfall in idealized simulations of radiative-convective equilibrium with a cloud-resolving model. In a region that is partly an island and mostly ocean, precipitation over the island falls primarily in a regular, strong, afternoon thunderstorm, with a time-mean rainfall rate more than double the domain average. I explore mechanisms for this island rainfall enhancement, investigate the importance of island size for my results, and find that the upper troposphere warms with the inclusion of an island, which may have implications for the large-scale tropical circulation. by Timothy Cronin. Ph. D. in Climate Physics and Chemistry 2014-10-07T19:17:40Z 2014-10-07T19:17:40Z 2014 2014 Thesis http://hdl.handle.net/1721.1/90605 890658251 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 171 pages application/pdf Massachusetts Institute of Technology
spellingShingle Earth, Atmospheric, and Planetary Sciences.
Cronin, Timothy (Timothy Wallace)
Land-atmosphere interaction and radiative-convective equilibrium
title Land-atmosphere interaction and radiative-convective equilibrium
title_full Land-atmosphere interaction and radiative-convective equilibrium
title_fullStr Land-atmosphere interaction and radiative-convective equilibrium
title_full_unstemmed Land-atmosphere interaction and radiative-convective equilibrium
title_short Land-atmosphere interaction and radiative-convective equilibrium
title_sort land atmosphere interaction and radiative convective equilibrium
topic Earth, Atmospheric, and Planetary Sciences.
url http://hdl.handle.net/1721.1/90605
work_keys_str_mv AT cronintimothytimothywallace landatmosphereinteractionandradiativeconvectiveequilibrium