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קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Global radiation climate changes in Israel
Year:
1992
Source of publication :
Climatic Change
Authors :
מורשת, שמואל
;
.
סטנהיל, ג'רלד
;
.
Volume :
22
Co-Authors:
Stanhill, G., Institute of Soils and Water, Agricultural Research Organization, Bet Dagan, 50250, Israel
Moreshet, S., Institute of Soils and Water, Agricultural Research Organization, Bet Dagan, 50250, Israel
Facilitators :
From page:
121
To page:
138
(
Total pages:
18
)
Abstract:
A detailed study of the 26-year series of global radiation K↓, measurements at Bet Dagan, the Israel Meteorological Service's pyranometer station in the central coastal plain of Israel, confirmed earlier findings of a significant reduction in insolation which were based on a small sample of this data set (Stanhill and Moreshet, 1992). Between 1956 and 1987 the annual reduction averaged 45.2 ± 4.3 MJ m-2, equivalent to -0.63% yr-1. Relatively the reduction was greater in midwinter (-0.91% yr-1), than midsummer (-0.56% yr-1), and under average (-0.63% yr-1), than cloudless (-0.48% yr-1) sky conditions. No changes were found in the degree of cloud cover observed at Bet Dagan. The annual decrease of K↓ at Bet Dagan was highly correlated (r = -0.78) with the increase in the number of motor vehicles using the major roads passing within 1 km of the site: each additional vehicle passing was associated with a 21.5 J m-2 decrease in K↓ The causal nature of this correlation was confirmed by the difference of 18% found in daily values of K↓ measured at Bet Dagan under traffic-free and extremely congested road conditions. The reduction in the K↓ at Bet Dagan could not, however, be attributed exclusively to the increase in motor traffic in the immediate vicinity of the site, as no significant difference was found in values measured at a relatively traffic-free site 2 km downwind of the pyranometer station. The effect of aerosol pollutants originating in Tel Aviv - the major urban and industrial connurbation upwind of Bet Dagan - was confirmed by the changes recorded in the relative size of the direct and diffuse components of K↓ measured at this site. The importance of pollution from Tel Aviv would also explain the absence of any significant changes in the annual values of K↓ measured at Jerusalem, a smaller and less industrialized urban center 46 km downwind of Bet Dagan, or at Qidron, an uninhabited, isolated site on the NW coast of the Dead Sea, 25 km further downwind. © 1992 Kluwer Academic Publishers.
Note:
Related Files :
עוד תגיות
תוכן קשור
More details
DOI :
10.1007/BF00142962
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
26973
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:27
Scientific Publication
Global radiation climate changes in Israel
22
Stanhill, G., Institute of Soils and Water, Agricultural Research Organization, Bet Dagan, 50250, Israel
Moreshet, S., Institute of Soils and Water, Agricultural Research Organization, Bet Dagan, 50250, Israel
Global radiation climate changes in Israel
A detailed study of the 26-year series of global radiation K↓, measurements at Bet Dagan, the Israel Meteorological Service's pyranometer station in the central coastal plain of Israel, confirmed earlier findings of a significant reduction in insolation which were based on a small sample of this data set (Stanhill and Moreshet, 1992). Between 1956 and 1987 the annual reduction averaged 45.2 ± 4.3 MJ m-2, equivalent to -0.63% yr-1. Relatively the reduction was greater in midwinter (-0.91% yr-1), than midsummer (-0.56% yr-1), and under average (-0.63% yr-1), than cloudless (-0.48% yr-1) sky conditions. No changes were found in the degree of cloud cover observed at Bet Dagan. The annual decrease of K↓ at Bet Dagan was highly correlated (r = -0.78) with the increase in the number of motor vehicles using the major roads passing within 1 km of the site: each additional vehicle passing was associated with a 21.5 J m-2 decrease in K↓ The causal nature of this correlation was confirmed by the difference of 18% found in daily values of K↓ measured at Bet Dagan under traffic-free and extremely congested road conditions. The reduction in the K↓ at Bet Dagan could not, however, be attributed exclusively to the increase in motor traffic in the immediate vicinity of the site, as no significant difference was found in values measured at a relatively traffic-free site 2 km downwind of the pyranometer station. The effect of aerosol pollutants originating in Tel Aviv - the major urban and industrial connurbation upwind of Bet Dagan - was confirmed by the changes recorded in the relative size of the direct and diffuse components of K↓ measured at this site. The importance of pollution from Tel Aviv would also explain the absence of any significant changes in the annual values of K↓ measured at Jerusalem, a smaller and less industrialized urban center 46 km downwind of Bet Dagan, or at Qidron, an uninhabited, isolated site on the NW coast of the Dead Sea, 25 km further downwind. © 1992 Kluwer Academic Publishers.
Scientific Publication
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