scholarly journals Diurnal variation in vertical air motion over a tropical station, Gadanki (13.5°N, 79.2°E), and its effect on the estimation of mean vertical air motion

2009 ◽  
Vol 114 (D20) ◽  
Author(s):  
K. N. Uma ◽  
T. Narayana Rao
Keyword(s):  
Diurnal Variation ◽  
Air Motion ◽  
Tropical Station

scholarly journals Diurnal variability of the atmospheric boundary layer height over a tropical station in the Indian monsoon region

2017 ◽  
Vol 17 (1) ◽  
pp. 531-549 ◽  
Author(s):  
Sanjay Kumar Mehta ◽  
Madineni Venkat Ratnam ◽  
Sukumarapillai V. Sunilkumar ◽  
Daggumati Narayana Rao ◽  
Boddapaty V. Krishna Murthy
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Diurnal Variation ◽  
Indian Monsoon ◽  
Winter Season ◽  
Monsoon Region ◽  
Diurnal Variability ◽  
The Mean ◽  
Indian Monsoon Region ◽  
Tropical Station

Abstract. The diurnal variation of atmospheric boundary layer (ABL) height is studied using high-resolution radiosonde observations available at 3 h intervals for 3 days continuously from 34 intensive campaigns conducted during the period December 2010–March 2014 over a tropical station Gadanki (13.5° N, 79.2° E; 375 m), in the Indian monsoon region. The heights of the ABL during the different stages of its diurnal evolution, namely, the convective boundary layer (CBL), the stable boundary layer (SBL), and the residual layer (RL) are obtained to study the diurnal variabilities. A clear diurnal variation is observed in 9 campaigns out of the 34 campaigns. In 7 campaigns the SBL did not form in the entire day and in the remaining 18 campaigns the SBL formed intermittently. The SBL forms for 33–55 % of the time during nighttime and 9 and 25 % during the evening and morning hours, respectively. The mean SBL height is within 0.3 km above the surface which increases slightly just after midnight (02:00 IST) and remains almost constant until the morning. The mean CBL height is within 3.0 km above the surface, which generally increases from morning to evening. The mean RL height is within 2 km above the surface which generally decreases slowly as the night progresses. The diurnal variation of the ABL height over the Indian region is stronger during the pre-monsoon and weaker during winter season. The CBL is higher during the summer monsoon and lower during the winter season while the RL is higher during the winter season and lower during the summer season. During all the seasons, the ABL height peaks during the afternoon (∼ 14:00 IST) and remains elevated until evening (∼ 17:00 IST). The ABL suddenly collapses at 20:00 IST and increases slightly in the night. Interestingly, it is found that the low level clouds have an effect on the ABL height variability, but the deep convective clouds do not. The lifting condensation level (LCL) is generally found to occur below the ABL for the majority of the database and they are randomly related.

Diurnal variation of ducts observed over a tropical station, Gadanki, using high-resolution GPS radiosonde observations

Radio Science ◽  
2016 ◽  
Vol 51 (4) ◽  
pp. 247-258 ◽  
Author(s):  
G. Manjula ◽  
M. Roja Raman ◽  
M. Venkat Ratnam ◽  
A. V. Chandrasekhar ◽  
S. Vijaya Bhaskara Rao
Keyword(s):  
High Resolution ◽  
Diurnal Variation ◽  
Tropical Station ◽  
Gps Radiosonde

scholarly journals Diurnal variability of the Atmospheric Boundary Layer height over a tropical station in the Indian Monsoon Region

2016 ◽  
Author(s):  
Sanjay Kumar Mehta ◽  
Madineni Venkat Ratnam ◽  
Sukumarapillai V. Sunilkumar ◽  
Daggumati Narayana Rao ◽  
Boddapati V. Krishna Murthy
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Diurnal Variation ◽  
Indian Monsoon ◽  
Winter Season ◽  
Monsoon Region ◽  
Diurnal Variability ◽  
The Mean ◽  
Indian Monsoon Region ◽  
Tropical Station

Abstract. The diurnal variation of atmospheric boundary layer (ABL) height is studied using high resolutions radiosonde observations available every 3-h intervals for 3 days continuously from 34 intensive campaigns conducted during the period December 2010–March 2014 over a tropical station Gadanki (13.5° N, 79.2° E), in the Indian monsoon region. The heights of the ABL during the different stages of its diurnal evolution, namely, the convective boundary layer (CBL), the stable boundary layer (SBL), and the residual layer (RL) are obtained to study the diurnal variability. A clear diurnal variability in 9 campaigns is observed while in 7 campaigns the SBL does not form for the entire day and in the remaining 18 campaigns the SBL form intermittently. The SBL forms 33 %–55 % during nighttime and 9 % and 25 % during the evening and morning hours, respectively. The mean SBL height is within 0.3 km above the surface which increases slightly just after midnight (0200 IST) and remain almost steady till morning. The mean CBL height is within 3.0 km above the surface which generally increases from morning to evening. The mean RL height is within 2 km above the surface which generally decreases slowly as the night progresses. Diurnal variation of the ABL height over the Indian region is stronger during the pre-monsoon and weaker during winter season. The CBL is higher during the summer monsoon and lower during the winter season while the RL is higher during winter season and lower during summer season. During all the seasons, the ABL height peaks during the afternoon (~ 1400 IST) and remains elevated till evening (~ 1700 IST). The ABL suddenly collapses at 2000 IST due to cooling after the sunset and increases slightly over night. Interestingly, it is found that the low level clouds have an effect on the ABL height variability, but not the deep convective clouds.

Diurnal variation of surface currents at a tropical station

2010 ◽  
Vol 72 (1) ◽  
pp. 77-82 ◽  
Author(s):  
M.N. Kulkarni ◽  
S.D. Pawar ◽  
P. Murugavel ◽  
V. Gopalakrishnan
Keyword(s):  
Diurnal Variation ◽  
Surface Currents ◽  
Tropical Station

scholarly journals Diurnal variation of tropospheric temperature at a tropical station

2001 ◽  
Vol 19 (8) ◽  
pp. 1001-1005 ◽  
Author(s):  
K. Revathy ◽  
S. R. Prabhakaran Nayar ◽  
B. V. Krishna Murthy
Keyword(s):  
Diurnal Variation ◽  
Vertical Velocity ◽  
Lower Stratosphere ◽  
Atmospheric Composition ◽  
Tropospheric Temperature ◽  
Composition And Structure ◽  
Mst Radar ◽  
Tropical Station ◽  
Tropopause Temperature ◽  
Radar Technique

Abstract. The vertical velocity in the troposphere-lower stratosphere region measured using MST radar has been utilized to evaluate the temperature profile in the region. The diurnal variation of the tropospheric temperature on one day in August 1998 at the tropical station Gadanki (13.5° N, 79.2° E) has been studied using the MST radar technique. The diurnal variation of the temperature revealed a prominent diurnal variation with the peak in the afternoon hours increasingly delayed in altitude. The tropopause temperature and altitude exhibited a clear diurnal cycle.Key words. Atmospheric composition and structure (pressure, density and temperature; troposphere - composition and chemistry; instruments and technique)

scholarly journals I. On the luni-solar variations of magnetic declination and horizontal force at Bombay, and of declination at Trevandrum

1887 ◽  
Vol 178 ◽  
pp. 1-43 ◽  
Keyword(s):  
Diurnal Variation ◽  
Whole Body ◽  
Horizontal Force ◽  
Magnetic Disturbance ◽  
The Moon ◽  
Tropical Regions ◽  
Meteorological Observations ◽  
Tropical Station ◽  
Small Disturbances

In the early attempts to investigate the influence of the moon upon terrestrial magnetism, the observations dealt with extended over periods so limited that little was possible beyond determining the average character of the lunar diurnal variation. This was mainly because magnetic disturbance tends—and especially in extra-tropical regions—to mask the minute variations that depend upon the moon. The series of observations made at the Coldba Observatory, Bombay, and discussed in the present paper, extending over twenty-five years in the case of the declination and over twenty-six and a half years in the case of the horizontal force, possesses therefore the double advantage of being originally affected by only the relatively small disturbances of a tropical station, and of being lengthy enough to secure an approximate elimination of such disturbance as is involved in it, even by combination of portions only of the whole body of observations. 2. The instruments used at Colába were made by Grubb, of Dublin, and are like those described in the report (of 1840) of the Committee of Physics of the Koyal Society, the magnets being fifteen inches long. An account of them and of their history will be found in the * Appendices to the Bombay Magnetical and Meteorological Observations, 1879 to 1882 / pages [84] and [138]: and to this account reference may be made for particulars as to the adjustments and determination of scale coefficients of both the declination and horizontal force magnetometers, and as to the determination of the temperature coefficient of the latter instrument. The following extract is, however, given in full, the matter of it being essential to an understanding of the principal object of this paper.

Fibrinolysis and Alimentary Lipaemia in Whites and Bantus; Their Relationship and Response to Intravenous Heparin

1964 ◽  
Vol 11 (01) ◽  
pp. 108-118 ◽  
Author(s):  
H Lackner ◽  
R Sougin-Mibashan
Keyword(s):  
Diurnal Variation ◽  
Fibrinolytic Activity ◽  
Butter Fat ◽  
Intravenous Heparin ◽  
The Difference

Summary and Conclusion1. Diurnal variation in fibrinolysis is marked in the Whites and almost absent in the Bantu. >2. The difference in fibrinolytic activity beween White and Bantu has been confirmed, but was found to decrease over the course of the morning due to diurnal variation in the White subjects.3. The ingestion of butter fat does not inhibit fibrinolysis to any appreciable extent in either White or Bantu.4. The accelerating effect of heparin on fibrinolysis was found to be present in lipaemic plasma, but appears to be distinct from the fat-clearing effect.

STUDIES ON DIURNAL VARIATION IN THYROID ACTIVITY

1962 ◽  
Vol 40 (3_Suppl) ◽  
pp. S149 ◽  
Author(s):  
A. Walser ◽  
H. Lüthy ◽  
H. R. Jenzer
Keyword(s):  
Diurnal Variation ◽  
Thyroid Activity
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