scholarly journals Impact of the Indian Ocean high pressure system on winter precipitation over western and southwestern Australia

2011 ◽  
Vol 61 (3) ◽  
pp. 159-170 ◽  
Author(s):  
S Hameed ◽  
M Iqbal ◽  
Rehman Saqib-ur ◽  
D Collins
Keyword(s):  
High Pressure ◽  
Indian Ocean ◽  
Winter Precipitation ◽  
Pressure System ◽  
Southwestern Australia ◽  
High Pressure System ◽  
The Indian Ocean ◽  
Indian Ocean High Pressure

Regional Precipitation Variability Associated with Zonal Movement of Indian Ocean High Pressure System

2019 ◽  
Vol 55 (4) ◽  
pp. 751-760 ◽  
Author(s):  
Bilal Ahmed Usmani ◽  
Saqib-Ur-Rehman ◽  
Syed Adnan Hussain ◽  
Kamran Khan ◽  
Atia Elahi
Keyword(s):  
High Pressure ◽  
Indian Ocean ◽  
Precipitation Variability ◽  
Pressure System ◽  
High Pressure System ◽  
Indian Ocean High Pressure

scholarly journals Influence of Indian Ocean high pressure on streamflow variability over southwestern Australia

2014 ◽  
Vol 57 (2) ◽  
Author(s):  
Saqib Ur Rehman
Keyword(s):  
High Pressure ◽  
Indian Ocean ◽  
Southern Oscillation Index ◽  
Southern Oscillation ◽  
Principal Component ◽  
Southwestern Australia ◽  
Catchment Areas ◽  
Streamflow Variability ◽  
The Indian Ocean ◽  
Indian Ocean High Pressure

<p> </p><p>The seasonal and interannual variability of the southwestern Australia streamflow was examined based on re-analysis dataset from the National Centers for Environmental Prediction / National Center for Atmospheric Research, plus monthly streamflow data from 17 meteorological stations obtained from the Department of Water of the Australian Water Resource Council (1976-2008). Significant findings reveal that since the middle of the last century, the early winter (May-August) streamflow variability over southwestern Australia has been associated with variability in the intensity of the Indian Ocean high pressure (IOHP) system, as well as the zonal movement of the high pressure system across the Indian Ocean. Of note, however, the emphasis in the previous studies has linked the ongoing winter drought in western Australia to changes in sea level pressure, both on a local basis and over larger areas. We introduce objective indices for the area-weighted pressure of the IOHP, and the IOHP area-weighted latitude (IOHLT) and longitude (IOHLN) positions. When the IOHP is shifted to the east, there is less streamflow in the southwestern Australian rivers that are examined in this study. The situation is reversed when the IOHP is shifted to the west, when there is more streamflow in the southwestern Australian rivers. The characteristics of the streamflow pattern are determined for the river catchment areas located around the coastal region over southwestern Australia using principal component analysis. The first principal component taken into consideration describes 84.43% of the total variance. The multiple correlation between the loading of the first principal component scores of the streamflow and the IOHP and IOHLN is 0.54, while the correlation between the southern oscillation index is 0.44. Centers of action indices explain 29% of the streamflow variability, while the southern oscillation index explains only of the 19% streamflow variability. This discovery is of real importance for the definition of the physical mechanism of seasonal (May-August) streamflow variability of southwestern Australian and the IOHP.</p><p><span style="text-decoration: underline;"><br /></span></p>

scholarly journals Synoptic perspectives on pollutant transport patterns observed by satellites over East Asia: Case studies with a conceptual model

2016 ◽  
Author(s):  
Hyun Cheol Kim ◽  
Soontae Kim ◽  
Seok-Woo Son ◽  
Pius Lee ◽  
Chun-Sil Jin ◽  
...  
Keyword(s):  
High Pressure ◽  
East Asia ◽  
Southern China ◽  
Low Pressure ◽  
Pressure System ◽  
Weather Patterns ◽  
High Pressure System ◽  
Synoptic Weather ◽  
Low Pressure System ◽  
Transport Patterns

Abstract. We demonstrate that daily pollutant transport patterns in East Asia are visible from satellite images when inspected with corresponding synoptic weather analyses. Transport pathways of air pollutants in East Asia are investigated using satellite observations, surface weather charts, and chemical-transport model simulations. It is found that during cool season (fall to spring), pollutant transports in East Asia are largely determined by synoptic weather patterns associated with high pressure system over southern China, which is extended from the Siberia High, and low pressure system over Manchuria, which is initiated by Altai-Sayan cyclogenesis. Based on the relative location and strength of these weather systems, three types of synoptic weather patterns that may contribute to pollutants transport in East Asia, especially in China and Korea, are identified: i.e., (1) a strengthening of the Siberian High and its southeastward propagation; (2) a high-pressure system over southern China followed by a frontal passage associated with a northern low-pressure system; and (3) a stagnant high-pressure system over southern China. For all three patterns, the high-pressure system in southern China is essential for the development of regional air pollution, while frontal activities associated with low-pressure system provide a forcing mechanism to transport those pollutants eastward or southeastward. Observed and simulated surface PM distributions show good agreement in both aerosol optical depth and NO2 column density further implying that anthropogenic emissions also contribute to regional events of high surface PM concentrations. It is argued that the quasi-periodic migration of synoptic weather systems in East Asia works as an efficient pump of pollutants; i.e., regional air pollutions developed under high-pressure systems are transported downstream by low-pressure systems.

scholarly journals Polydimethylsiloxane Connection for Quartz Microchips in a High-Pressure System

2004 ◽  
Vol 20 (12) ◽  
pp. 1721-1723 ◽  
Author(s):  
Yukihiro SHINTANI ◽  
Keiji HIRAKO ◽  
Masanori MOTOKAWA ◽  
Yoshihiko TAKANO ◽  
Masahiro FURUNO ◽  
...  
Keyword(s):  
High Pressure ◽  
Pressure System ◽  
High Pressure System
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