HOME >> BIOLOGY >> NEWS
Behind the big dry

A 27-year dry spell affecting the southwestern part of Australia could be a foretaste of future national experiences under the Greenhouse Effect.

CSIRO scientists are investigating the possibility that a climate shift has brought a long-term decline in rainfall over southwest Western Australia. Measurements indicate a slow decline in rainfall since the 1940s-50s, leading to the present drier regime, says Dr Bryson Bates of CSIRO Land and Water.

In some parts of the southwest, average rainfall appears to have settled into a pattern about 20 per cent lower than the norm for the first half of the 20th century but, as the thirsty landscape soaks up more moisture, this has led to a 40 per cent reduction in inflow to Perths dams. At the start of this summer, the dams were less than a third of capacity.

The immediate cause, says Dr Bates, is a clearly discernible climate shift that took place in the mid 1970s.

At that time the tropical Pacific warmed abruptly and stayed warm, and there was a sudden warming in sea surface temperatures in the Indian Ocean. Since then there have been unusually frequent, persistent and intense El Ninos, and fewer La Ninas.

Working from global atmospheric data, the researchers have been trying to work out what this all means for local climate and rainfall across the southern part of WA.

The most obvious fact to emerge is that there are now more dry days than before due to an increase in the presence of high pressure cells to southeast of the region, causing moisture-bearing air streams to miss the continent. The encouraging news is that the system appears to have stabilized somewhat, although there is a large amount of year-to-year variability.

The main change lies in the absence of particularly wet winters, which once recharged the dams. Since 1975 there has been only one winter of above average inflow to the dams, compared with 13 in the period from 1950 to 1975.

As to wh
'"/>

Contact: Dr Bryson Bates
Bryson.Bates@csiro.au
61-8-9333-6330
CSIRO Australia
14-Mar-2002


Page: 1 2

Related biology news :

1. UMass virologist publishes book on "The Real Science Behind The X-Files"
2. Global Change: Will Some Plant Species Be Left Behind? Studies Of EcosystemDynamics Make Wide Use Of Computer Models
3. Human Cloning: Grappling With Reality Penn Bioethicist To Explore The Facts Behind The Hysteria
4. Scientists Unlock Mystery Behind Proteins That Keep Tuberculosis Bacteria Alive; Finding Leads To Research Into New Drug Treatments

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:11/16/2018)... ... November 16, 2018 , ... Bergeson & Campbell, P.C. (B&C®) ... will engage listeners in intelligent, insightful conversation about everything related to industrial, pesticidal, ... team of lawyers, scientists, and consultants will keep listeners abreast of the changing ...
(Date:11/15/2018)... ... ... Firmex today released new research on merger and acquisition advisory fees prepared in ... worldwide to compile the third annual M&A Fee Guide 2018-19 report. Contributors BDO ... , Highlights in the 2018-19 Report:, , The latest data ...
(Date:11/15/2018)... ... November 14, 2018 , ... ... lab, will present new scientific evidence on gene-disease relationships and how it supports ... to be held in Atlanta, November 14-17. , Ambry has been selected ...
Breaking Biology News(10 mins):
(Date:11/29/2018)... ... November 29, 2018 , ... RAGS, today announced the closing of ... Fund, with participation from existing investor and board member Jeremy Andrus, CEO of Traeger ... The additional funding will enable the company to accelerate its growth and expand the ...
(Date:11/20/2018)... VANCOUVER, British Columbia (PRWEB) , ... November 19, ... ... Repositories (ISBER) is pleased to announce the release of the Chinese translation of ... released in January 2018, is a practice-changing publication aimed at advancing the science ...
(Date:11/15/2018)... SAN FRANCISCO (PRWEB) , ... November 14, 2018 ... ... Indiegogo campaign, bringing the world’s first self-learning snore-reduction mask to the public. It ... to a poorer quality of sleep for themselves and their partner. The resulting ...
(Date:11/13/2018)... ... November 13, 2018 , ... Aditya Humad, Managing ... last week that asserts it is still trending upward with growing valuations based ... analysis describes market consolidation, pricing pressure and increased competition as reasons often cited ...
Breaking Biology Technology:
Cached News: