An empirical relationship between temperature, vapour pressure deficit and wind speed and evaporation during a winter chinook

Nkemdirim, Lawrence C.

doi:10.1007/bf00867469

Cited by 13 publications

(5 citation statements)

References 7 publications

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“…This is one possible interpretation of the negative correlation between ET and precipitation over such areas [Pomeroy et al, 1998;Kerkez et al, 2012]. However, anomalies in the other variables, such as wind speed and humidity, may also have governed snow water loss in winter [Nkemdirim, 1991].…”

Section: Seasonality Of Land-atmosphere Couplingmentioning

confidence: 97%

Production of a combined land surface data set and its use to assess land‐atmosphere coupling in China

et al. 2017

JGR Atmospheres

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Land‐atmosphere interactions play an important role in shaping regional climate and its variability. In land‐atmosphere coupling study, a fundamental challenge is data limitation, such as the sparsity of long‐term land observations and uncertainty in individual model simulations. This study produces a multisource combined land surface data set using a Bayesian model averaging method, for the assessment of land‐atmosphere coupling across China. We employ the newly produced soil moisture and evapotranspiration, together with satellite‐derived soil moisture and observation‐based evapotranspiration to assess spatiotemporal characteristics of the coupling with observed precipitation and temperature. We also define a coupling index to identify region‐specific regimes. The results have shown that strong coupling occurs over northern China, particularly in the transition zone between dry and wet climate. Here summer coupling is dominated by land evaporative water storage. Over the southern humid regions and regions at high altitudes, land‐atmosphere coupling in summer is characterized by an energy‐limited regime. Estimated coupling strengths vary with season and variable used. Precipitation‐related couplings are generally stronger in summer; temperature‐related couplings are stronger in summer in dry areas but stronger in winter in humid areas. These findings provide a multisource combined representation and cross validation of spatial and temporal characteristics of land‐atmosphere coupling across China. The implications are that northern China is a critical region for climate change/variability impact and adaptation assessment.

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Section: Seasonality Of Land-atmosphere Couplingmentioning

confidence: 97%

Production of a combined land surface data set and its use to assess land‐atmosphere coupling in China

et al. 2017

JGR Atmospheres

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“…Chinooks occur during the winter months and are characterized by westerly surface winds blowing from south-southwest to westnorthwest (225°to 315°measured clockwise from true north) inclusive, a wind speed stronger than 4.5 ms Ϫ1 (16.4 km/h) and "gusty," a sharp upward revision of air temperature with the eventual mean daily value exceeding the normal for the day, a marked drop in relative humidity, and both the increase of air temperature and the drop in relative humidity corresponding perfectly to the western wind gusts. 30 The magnitude of increase in temperature and decrease in humidity during a Chinook event cannot be quantified because of wide variations in Chinook intensity. Chinooks are characterized by a nearly vertical increase in temperature and decrease in humidity from "background" levels during which shifts in wind direction to "Chinook mode" normally correspond.…”

Section: Weather Analysismentioning

confidence: 99%

Weather, Chinook, and Stroke Occurrence

Field

Hill

2002

Stroke

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Background-Changes in weather and season have been linked to stroke occurrence. However, the association has been inconsistent across stroke types. Calgary is a city in the Chinook belt and is subject to high variability in weather conditions. Methods-We obtained hourly weather data over a 5-year period from 1996 to 2000; Chinook events were identified according to the accepted definition. We reviewed administrative data to determine stroke occurrence and defined stroke types to maximize specificity of diagnosis. To examine the hypothesis that weather affected the number of strokes occurring in a given day, we compared average daily stroke occurrence on Chinook days and non-Chinook days; we compared mean daily temperature, relative humidity, barometric pressure, and wind speed by the number of strokes occurring on any given day. Results-Annual variation in stroke frequency was observed. No seasonal, monthly, or weekly variation in overall stroke occurrence or occurrence by type was evident. No relationship with changes in weather parameters was observed. Conclusions-We found no association between weather changes and stroke occurrence. A cause-and-effect relationship between weather and stroke occurrence is dubious because of a lack of consistency across studies. (Stroke. 2002;33: 1751-1758.)

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“…A sharp upward revision of air temperature occurs, and there is a marked drop in relative humidity. 3 Because of the Chinooks, the day-today weather variability in southern Alberta near the Rocky Mountains is probably greater during the winter than anywhere else in the world. 15 Because of these rapid, frequent, and severe weather fluctuations, southern Alberta may be the ideal location to study weather influences on migraine.…”

Section: Commentsmentioning

confidence: 99%

Effect of Chinook Winds on the Probability of Migraine Headache Occurrence

Piorecky¹,

Becker²,

Rose³

1997

Headache

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Our objective was to determine if Chinook weather conditions in the Calgary area increase the probability of headache attacks in migraine sufferers. Environment Canada meteorologic summaries for January through June 1992 were analyzed and times of Chinook wind onset identified. Chinook weather conditions were defined as calendar days when Chinook winds were present and the calendar day immediately preceding Chinook wind onset. The diaries of 13 migraine patients were analyzed, and times of headache onset classified according to the existing weather conditions. The probability of migraine headache onset was greater on days with Chinook weather (17.26%) than on non-Chinook days (14.65%) (P = 0.042). Older patients appeared more weather sensitive than younger patients. For patients over age 50, the probability of migraine occurrence on Chinook weather days was much greater than on non-Chinook days (P = 0.007). Chinook weather conditions increase the probability of migraine headache occurrence. Older migraine sufferers appear particularly vulnerable to this effect.

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An empirical relationship between temperature, vapour pressure deficit and wind speed and evaporation during a winter chinook

Cited by 13 publications

References 7 publications

Production of a combined land surface data set and its use to assess land‐atmosphere coupling in China

Production of a combined land surface data set and its use to assess land‐atmosphere coupling in China

Weather, Chinook, and Stroke Occurrence

Effect of Chinook Winds on the Probability of Migraine Headache Occurrence

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