Identification

Title

A paleogeographic approach to aerosol prescription in simulations of deep time climate

Abstract

Aerosols have important effects on the Earth's radiative balance and are normally included in simulations of present day climate. For simulations of present day or recent past climates, observational information can be used to constrain spatiotemporal variability in aerosol loading. For the deep past, aerosol changes are generally ignored. Here we describe how to use the Community Climate System Model version 4 (CCSM4), standard boundary conditions for a deep time climate simulation, and pre-industrial emissions information to generate a paleogeographic aerosol prescription. This prescription is then applied to a previously published simulation of the Late Permian (251 Ma) to evaluate the how the model climate is affected by the new aerosol prescription relative to the aerosol distribution originally imposed. The new aerosol prescription results in a broadly warmer and wetter climate with a somewhat stronger Pangaean monsoon. Using spatiotemporally varying and speciated aerosol is equivalent to reducing the optical depth of a uniform background aerosol with sulfate-like properties by similar to 30-50%.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d78916mn

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2012-11-01T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact