RECENT CHANGES IN FROST DAYS AND THE FROST-FREE SEASON IN THE UNITED STATES

RECENT CHANGES IN FROST DAYS AND THE FROST-FREE SEASON IN THE UNITED STATES One of the signals expected with greenhouse warming is a change in what are now considered extreme temperatures. In this paper one type of extreme is examined for the 194899 period, that is, a change in the number of days when the minimum daily temperature dips below freezing or frost days. This is approached by looking at two questions: 1) have there been changes in the number of frost days per year, or per season, and 2) are there trends in the dates of the first autumn frost, last spring frost, and length of the frost-free season? Results show that the country as a whole has experienced a slight decrease in the number of days, with the biggest decreases in the winter and spring. Changes in frost dates for autumn show small changes to a later date, but the date of the last-spring freeze shows a distinct move to an earlier date. This results in an increase in the frost-free season. However, there is a distinct spatial pattern to the results that is consistent with the spatial pattern of annual temperature trends for the twentieth century. The geographical pattern shows the western United States with the largest decreases in frost days, and increases in frost-free season length. But the southeast United States, which is one of the few areas of the world showing cooling over the twentieth century, has no significant changes in the number of frost days or the frost-free season. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of the American Meteorological Society American Meteorological Society

RECENT CHANGES IN FROST DAYS AND THE FROST-FREE SEASON IN THE UNITED STATES

Loading next page...
 
/lp/ams/recent-changes-in-frost-days-and-the-frost-free-season-in-the-united-m0BmFQ38yV
Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0477
D.O.I.
10.1175/1520-0477-83.9.1327
Publisher site
See Article on Publisher Site

Abstract

One of the signals expected with greenhouse warming is a change in what are now considered extreme temperatures. In this paper one type of extreme is examined for the 194899 period, that is, a change in the number of days when the minimum daily temperature dips below freezing or frost days. This is approached by looking at two questions: 1) have there been changes in the number of frost days per year, or per season, and 2) are there trends in the dates of the first autumn frost, last spring frost, and length of the frost-free season? Results show that the country as a whole has experienced a slight decrease in the number of days, with the biggest decreases in the winter and spring. Changes in frost dates for autumn show small changes to a later date, but the date of the last-spring freeze shows a distinct move to an earlier date. This results in an increase in the frost-free season. However, there is a distinct spatial pattern to the results that is consistent with the spatial pattern of annual temperature trends for the twentieth century. The geographical pattern shows the western United States with the largest decreases in frost days, and increases in frost-free season length. But the southeast United States, which is one of the few areas of the world showing cooling over the twentieth century, has no significant changes in the number of frost days or the frost-free season.

Journal

Bulletin of the American Meteorological SocietyAmerican Meteorological Society

Published: Sep 29, 2002

There are no references for this article.

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off