scholarly journals A NUMERICAL STUDY ON LONG-WAVE GENERATION DUE TO ATMOSPHERIC-PRESSURE VARIATION

2012 ◽  
Vol 1 (33) ◽  
pp. 17
Author(s):  
Taro Kakinuma ◽  
Kosuke Fukita
Keyword(s):  
Atmospheric Pressure ◽  
Numerical Study ◽  
Okinawa Trough ◽  
Grid Point ◽  
Pressure Profile ◽  
Pressure Variation ◽  
Long Waves ◽  
Pressure Waves ◽  
Oscillation System ◽  
Long Wave

The generation and propagation of long waves due to atmospheric-pressure variation have been numerically simulated, where the atmospheric-pressure waves are assumed to travel in the eastern direction over East Chine Sea. The wave height of long waves is larger as the moving velocity of the recovery point of water surface pressed by the atmospheric pressure is close to the long-wave celerity. Before attenuation of the harbor oscillation in Urauchi Bay, Kamikoshiki Island, the incidence of long waves can continue because of the oscillation system generated between the main island of Kyushu and Okinawa Trough. The pressure profiles of atmospheric-pressure waves supposed to have concerned the large harbor oscillation in Urauchi Bay from 2009 to 2010 are classified into four patterns based on the Grid Point Value pressure data. The incident long waves causing the largest harbor oscillation in Urauchi Bay on Feb. 25, 2009 has been simulated with the estimated pressure-profile pattern, such that the largest harbor oscillation in Urauchi Bay should occur due to the atmospheric-pressure waves.

The response of a continental shelf to travelling pressure disturbances

1973 ◽  
Vol 24 (2) ◽  
pp. 143 ◽  
Author(s):  
VT Buchwald ◽  
RA de Szoeke
Keyword(s):  
Continental Shelf ◽  
Closed Form ◽  
Atmospheric Pressure ◽  
Step Function ◽  
Long Waves ◽  
Wave Number ◽  
Long Wave ◽  
Sinusoidal Disturbance ◽  
Speed Of Propagation ◽  
Rectangular Model

Assuming a rectangular model of a continental shelf, this paper sets out to calculate the response of the shelf and ocean regions to plane atmospheric pressure disturbances travelling with constant speed in a longshore direction. It is shown that, for a sinusoidal disturbance, there is resonance at a given speed of propagation c only if c lies between the speeds of long waves on the shelf and ocean regions, and then only if the wave number of the disturbance matches one of the possible modes of long waves trapped on the shelf. In addition, the passage of a pressure front along the shelf is modelled by a step function, and the response to such a disturbance is calculated in closed form. If the speed of the disturbance is between the speed of long waves in the shelf and ocean regions, then there is a wake of trapped long-wave modes, the amplitudes of which may be quite large compared with the change in the atmospheric pressure.

scholarly journals NUMERICAL STUDY ON THE ABNORMAL SURGE DUE TO ATMOSPHERIC PRESSURE VARIATION ON THE CENTRAL COAST OF VIETNAM

2019 ◽  
Vol 18 (4) ◽  
pp. 475-483
Author(s):  
Nguyen Ba Thuy
Keyword(s):  
Coastal Area ◽  
Atmospheric Pressure ◽  
Numerical Study ◽  
Wave Model ◽  
Pressure Variation ◽  
Central Coast ◽  
Atmospheric Disturbance ◽  
Coast Of Vietnam ◽  
Atmospheric Variation ◽  
Surge Height

In this study, the abnormal surge due to atmospheric pressure variation assumed to travel to the Central coast of Vietnam was simulated in some scenarios of maximum atmospheric variation (Pmax), the size (L) and the speed of the movement (Cp) of the atmospheric disturbance. The numerical model is based on two-dimensional long wave model considering the effect of atmospheric pressure variation on the sea level. The results showed that the surge height at the coastal area incresed as the size and maximum atmospheric variation of disturbance pressure increased. In which, when the traveling speed of atmospheric disturbance increased, the surge height increased, reaching to the maximum value of 0.72 m at Cp = 45 km/h, then decreasing. Meanwhile, the wave period decreased gradually to Cp = 30 km/h and was then almost unchanged. The coastal area around the latitude of 13oN was noted to have a higher surge level than both sides that may be due to the high steep of coastal topography. The results of the study are significant in investigation into the reason of abnormal surge in the area as well as serving the planning and disaster preparedness.

scholarly journals Propagation of radiosonde pressure sensor errors to ozonesonde measurements

2014 ◽  
Vol 7 (1) ◽  
pp. 65-79 ◽  
Author(s):  
R. M. Stauffer ◽  
G. A. Morris ◽  
A. M. Thompson ◽  
E. Joseph ◽  
G. J. R. Coetzee ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Atmospheric Pressure ◽  
Pressure Profile ◽  
Mixing Ratio ◽  
Concentration Cell ◽  
Pressure Profiles ◽  
Dependent Variables ◽  
Sensor Errors ◽  
Subsequent Addition ◽  
Total Column

Abstract. Several previous studies highlight pressure (or equivalently, pressure altitude) discrepancies between the radiosonde pressure sensor and that derived from a GPS flown with the radiosonde. The offsets vary during the ascent both in absolute and percent pressure differences. To investigate this problem further, a total of 731 radiosonde/ozonesonde launches from the Southern Hemisphere subtropics to northern mid-latitudes are considered, with launches between 2005 and 2013 from both longer term and campaign-based intensive stations. Five series of radiosondes from two manufacturers (International Met Systems: iMet, iMet-P, iMet-S, and Vaisala: RS80-15N and RS92-SGP) are analyzed to determine the magnitude of the pressure offset. Additionally, electrochemical concentration cell (ECC) ozonesondes from three manufacturers (Science Pump Corporation; SPC and ENSCI/Droplet Measurement Technologies; DMT) are analyzed to quantify the effects these offsets have on the calculation of ECC ozone (O3) mixing ratio profiles (O3MR) from the ozonesonde-measured partial pressure. Approximately half of all offsets are > ±0.6 hPa in the free troposphere, with nearly a third > ±1.0 hPa at 26 km, where the 1.0 hPa error represents ~ 5% of the total atmospheric pressure. Pressure offsets have negligible effects on O3MR below 20 km (96% of launches lie within ±5% O3MR error at 20 km). Ozone mixing ratio errors above 10 hPa (~ 30 km), can approach greater than ±10% (> 25% of launches that reach 30 km exceed this threshold). These errors cause disagreement between the integrated ozonesonde-only column O3 from the GPS and radiosonde pressure profile by an average of +6.5 DU. Comparisons of total column O3 between the GPS and radiosonde pressure profiles yield average differences of +1.1 DU when the O3 is integrated to burst with addition of the McPeters and Labow (2012) above-burst O3 column climatology. Total column differences are reduced to an average of −0.5 DU when the O3 profile is integrated to 10 hPa with subsequent addition of the O3 climatology above 10 hPa. The RS92 radiosondes are superior in performance compared to other radiosondes, with average 26 km errors of −0.12 hPa or +0.61% O3MR error. iMet-P radiosondes had average 26 km errors of −1.95 hPa or +8.75 % O3MR error. Based on our analysis, we suggest that ozonesondes always be coupled with a GPS-enabled radiosonde and that pressure-dependent variables, such as O3MR, be recalculated/reprocessed using the GPS-measured altitude, especially when 26 km pressure offsets exceed ±1.0 hPa/±5%.

Fiscal measurement and the effects of atmospheric pressure variation: Small deviations and large risks

2021 ◽  
pp. 102027
Author(s):  
Carlos Eduardo R.B. Barateiro ◽  
Claudio Makarovsky ◽  
Jorge Gomez Sanchez ◽  
José Rodrigues de Farias Filho ◽  
Alexandre do Valle Faria
Keyword(s):  
Atmospheric Pressure ◽  
Pressure Variation ◽  
Small Deviations
Sign in / Sign up

Export Citation Format

Share Document