Dynamics of dry air intrusion over India during summer monsoon breaks

2021 ◽  
Author(s):  
Rahul Singh ◽  
S. Sandeep
Keyword(s):  
Summer Monsoon ◽  
Dry Air

scholarly journals Desert Air Incursions, an Overlooked Aspect, for the Dry Spells of the Indian Summer Monsoon

2010 ◽  
Vol 67 (10) ◽  
pp. 3423-3441 ◽  
Author(s):  
T. N. Krishnamurti ◽  
A. Thomas ◽  
Anu Simon ◽  
Vinay Kumar
Keyword(s):  
Summer Monsoon ◽  
North Africa ◽  
Indian Summer Monsoon ◽  
Deep Convection ◽  
Central India ◽  
Hadley Cell ◽  
Dry Air ◽  
Blocking High ◽  
Dry Spells ◽  
Western Asia

Abstract The year 2009 was a major drought year for the Indian summer monsoon with a seasonal deficit of rainfall by 21.6%. Standard oceanic predictors such as ENSO and the Indian Ocean dipole are not consistent for these dry spells. There are a host of other parameters such as the Himalayan ice cover, the Eurasian snow cover, the passage of intraseasonal waves, and even accumulated effects of Asian pollution that have been considered for analysis of the dry spells of the monsoon. This paper presents another factor, the western Asian desert air incursions toward central India, and emphasizes the formation of a blocking high over western Asia as an important feature for these dry spells. The blocking high advects descending very dry air toward central India, portrayed using swaths of three-dimensional trajectories. This is a robust indicator for dry spells of the monsoon during the last several decades. This dry air above the 3-km level over central India strongly inhibits the vertical growth of deep convection. Some of the interesting antecedents of the formation of the blocking high include an eastward and somewhat northward extension of the ITCZ over North Africa, a stronger than normal local Hadley cell over North Africa, a strong subtropical jet stream over the southern Mediterranean, and strong conversions of anticyclonic shear vorticity to anticyclonic curvature vorticity. The dynamical antecedents of the aforementioned scenario in this study are related to many aspects of North African weather features. They are portrayed using both reanalysis datasets and ensemble modeling using a suite of coupled atmosphere–ocean models.

Definition of new summer monsoon index for Vietnam region

2018 ◽  
Vol 60 (1) ◽  
pp. 90-96
Author(s):  
Dang Mau Nguyen ◽  
Van Thang Nguyen ◽  
Keyword(s):  
Summer Monsoon ◽  
Monsoon Index ◽  
Definition Of

VARIABILITY IN THE INDIAN SUMMER MONSOON PRECIPITATION AND LAKE LEVELS IN EASTERN TIBET

2016 ◽  
Author(s):  
Melanie Perello ◽  
◽  
Broxton W. Bird ◽  
Yanbin Lei ◽  
Pratigya J. Polissar ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Monsoon Precipitation ◽  
Lake Levels ◽  
Eastern Tibet

scholarly journals Tungsten Oxide Based Sensor for Oxygen Detection

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 952 ◽  
Author(s):  
Wangi Sari ◽  
Simon Leigh ◽  
James Covington
Keyword(s):  
Metal Oxide ◽  
Linear Relationship ◽  
Tungsten Oxide ◽  
Spin Coating ◽  
Low Temperatures ◽  
Oxygen Sensor ◽  
High Response ◽  
Humid Air ◽  
Dry Air ◽  
Oxygen Detection

In this paper we report on the development tungsten oxide based chemiresistive sensors for the monitoring of oxygen at low temperatures (T ≤ 400 °C) in dry and humid air. The sensors were deposited onto alumina substrate by a combination of spin coating and a photolithographic process to define the sensing area. Our results show that the sensors comply with a linear relationship over a 0 to 20% concentration range, with a high response towards oxygen. The highest response was observed at 350 °C (ΔR/Ra = 7.8) in humid and in dry air (ΔR/Ra = 18). This result is a significant improvement over our previous experiments and we believe to take the concept of a metal-oxide based oxygen sensor a step closer.

Viscosity and Thermal Conductivity of Dry Air in the Gaseous Phase

1985 ◽  
Vol 14 (4) ◽  
pp. 947-970 ◽  
Author(s):  
K. Kadoya ◽  
N. Matsunaga ◽  
A. Nagashima
Keyword(s):  
Thermal Conductivity ◽  
Gaseous Phase ◽  
Dry Air

scholarly journals Post-Plasma Catalysis for Trichloroethylene Abatement with Ce-Doped Birnessite Downstream DC Corona Discharge Reactor

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 946
Author(s):  
Grêce Abdallah ◽  
Jean-Marc Giraudon ◽  
Rim Bitar ◽  
Nathalie De Geyter ◽  
Rino Morent ◽  
...  
Keyword(s):  
Corona Discharge ◽  
Active Oxygen Species ◽  
Surface Acidity ◽  
Good Stability ◽  
Ozone Decomposition ◽  
Moist Air ◽  
Plasma Catalysis ◽  
Dry Air ◽  
Water Tolerance ◽  
By Products

Trichloroethylene (TCE) removal was investigated in a post-plasma catalysis (PPC) configuration in nearly dry air (RH = 0.7%) and moist air (RH = 15%), using, for non-thermal plasma (NTP), a 10-pin-to-plate negative DC corona discharge and, for PPC, Ce0.01Mn as a catalyst, calcined at 400 °C (Ce0.01Mn-400) or treated with nitric acid (Ce0.01Mn-AT). One of the key points was to take advantage of the ozone emitted from NTP as a potential source of active oxygen species for further oxidation, at a very low temperature (100 °C), of untreated TCE and of potential gaseous hazardous by-products from the NTP. The plasma-assisted Ce0.01Mn-AT catalyst presented the best CO2 yield in dry air, with minimization of the formation of gaseous chlorinated by-products. This result was attributed to the high level of oxygen vacancies with a higher amount of Mn3+, improved specific surface area and strong surface acidity. These features also allow the promotion of ozone decomposition efficiency. Both catalysts exhibited good stability towards chlorine. Ce0.01Mn-AT tested in moist air (RH = 15%) showed good stability as a function of time, indicating good water tolerance also.

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