Relative Humidity Has Uneven Effects on Shifts From Snow to Rain Over the Western U.S
Predicting the phase of precipitation is fundamental to water supply and hazard forecasting. Phase prediction methods (PPMs) are used to predict snow fraction, or the ratio of snowfall to total precipitation. Common temperature‐based regression (Dai method) and threshold at freezing (0°C) PPMs had c...
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Published in | Geophysical research letters Vol. 44; no. 19; pp. 9742 - 9750 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Washington
John Wiley & Sons, Inc
16.10.2017
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Abstract | Predicting the phase of precipitation is fundamental to water supply and hazard forecasting. Phase prediction methods (PPMs) are used to predict snow fraction, or the ratio of snowfall to total precipitation. Common temperature‐based regression (Dai method) and threshold at freezing (0°C) PPMs had comparable accuracy to a humidity‐based PPM (TRH method) using 6 and 24 h observations. Using a daily climate data set from 1980 to 2015, the TRH method estimates 14% and 6% greater precipitation‐weighted snow fraction than the 0°C and Dai methods, respectively. The TRH method predicts four times less area with declining snow fraction than the Dai method (2.1% and 8.1% of the study domain, respectively) from 1980 to 2015, with the largest differences in the Cascade and Sierra Nevada mountains and southwestern U.S. Future Representative Concentration Pathway (RCP) 8.5 projections suggest warming temperatures of 4.2°C and declining relative humidity of 1% over the 21st century. The TRH method predicts a smaller reduction in snow fraction than temperature‐only PPMs by 2100, consistent with lower humidity buffering declines in snow fraction caused by regional warming.
Key Points
A humidity phase prediction method (PPM) had differing snow fraction (snowfall to precipitation) but similar accuracy to temperature PPMs
Hindcasts from 1980 to 2015 estimate less area with declining snow fraction trends using humidity‐based PPM compared to temperature‐only PPMs
Some GCMs project declines in relative humidity capable of buffering changes from snow to rain caused by warming temperatures
Plain Language Summary
The phase of precipitation as rain or snow when it lands on the ground can cause different flood risks and alter water supplies for people and ecosystems. Most of our water supply forecasting models use simple temperature‐only phase prediction methods, or PPMs, despite the fact that atmospheric conditions like humidity and pressure can also affect precipitation phase. In this study, we compared simple temperature‐only PPMs, with another PPM that included temperature and relative humidity. Relative humidity well‐below 100% acts to cool the falling snowflake through evaporation, similar to how sweating cools people through evaporative heat loss. We show that the different PPMs have relatively similar accuracy compared to observations. This gives confidence that we can hindcast back in time and forecast forward in time using the different PPMs and gridded climate datasets. We show that both hindcasts and forecasts are sensitive to the PPM chosen, with the PPM using relative humidity generally leading to more snowfall than the two temperature‐only PPMs. These results suggest that future declines in relative humidity may be sufficient to buffer declines in snowfall as temperatures warm over the 21st century. |
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AbstractList | Predicting the phase of precipitation is fundamental to water supply and hazard forecasting. Phase prediction methods (PPMs) are used to predict snow fraction, or the ratio of snowfall to total precipitation. Common temperature‐based regression (Dai method) and threshold at freezing (0°C) PPMs had comparable accuracy to a humidity‐based PPM (TRH method) using 6 and 24 h observations. Using a daily climate data set from 1980 to 2015, the TRH method estimates 14% and 6% greater precipitation‐weighted snow fraction than the 0°C and Dai methods, respectively. The TRH method predicts four times less area with declining snow fraction than the Dai method (2.1% and 8.1% of the study domain, respectively) from 1980 to 2015, with the largest differences in the Cascade and Sierra Nevada mountains and southwestern U.S. Future Representative Concentration Pathway (RCP) 8.5 projections suggest warming temperatures of 4.2°C and declining relative humidity of 1% over the 21st century. The TRH method predicts a smaller reduction in snow fraction than temperature‐only PPMs by 2100, consistent with lower humidity buffering declines in snow fraction caused by regional warming.
Key Points
A humidity phase prediction method (PPM) had differing snow fraction (snowfall to precipitation) but similar accuracy to temperature PPMs
Hindcasts from 1980 to 2015 estimate less area with declining snow fraction trends using humidity‐based PPM compared to temperature‐only PPMs
Some GCMs project declines in relative humidity capable of buffering changes from snow to rain caused by warming temperatures
Plain Language Summary
The phase of precipitation as rain or snow when it lands on the ground can cause different flood risks and alter water supplies for people and ecosystems. Most of our water supply forecasting models use simple temperature‐only phase prediction methods, or PPMs, despite the fact that atmospheric conditions like humidity and pressure can also affect precipitation phase. In this study, we compared simple temperature‐only PPMs, with another PPM that included temperature and relative humidity. Relative humidity well‐below 100% acts to cool the falling snowflake through evaporation, similar to how sweating cools people through evaporative heat loss. We show that the different PPMs have relatively similar accuracy compared to observations. This gives confidence that we can hindcast back in time and forecast forward in time using the different PPMs and gridded climate datasets. We show that both hindcasts and forecasts are sensitive to the PPM chosen, with the PPM using relative humidity generally leading to more snowfall than the two temperature‐only PPMs. These results suggest that future declines in relative humidity may be sufficient to buffer declines in snowfall as temperatures warm over the 21st century. Abstract Predicting the phase of precipitation is fundamental to water supply and hazard forecasting. Phase prediction methods (PPMs) are used to predict snow fraction, or the ratio of snowfall to total precipitation. Common temperature‐based regression (Dai method) and threshold at freezing (0°C) PPMs had comparable accuracy to a humidity‐based PPM ( T RH method) using 6 and 24 h observations. Using a daily climate data set from 1980 to 2015, the T RH method estimates 14% and 6% greater precipitation‐weighted snow fraction than the 0°C and Dai methods, respectively. The T RH method predicts four times less area with declining snow fraction than the Dai method (2.1% and 8.1% of the study domain, respectively) from 1980 to 2015, with the largest differences in the Cascade and Sierra Nevada mountains and southwestern U.S. Future Representative Concentration Pathway (RCP) 8.5 projections suggest warming temperatures of 4.2°C and declining relative humidity of 1% over the 21st century. The T RH method predicts a smaller reduction in snow fraction than temperature‐only PPMs by 2100, consistent with lower humidity buffering declines in snow fraction caused by regional warming. Key Points A humidity phase prediction method (PPM) had differing snow fraction (snowfall to precipitation) but similar accuracy to temperature PPMs Hindcasts from 1980 to 2015 estimate less area with declining snow fraction trends using humidity‐based PPM compared to temperature‐only PPMs Some GCMs project declines in relative humidity capable of buffering changes from snow to rain caused by warming temperatures Plain Language Summary The phase of precipitation as rain or snow when it lands on the ground can cause different flood risks and alter water supplies for people and ecosystems. Most of our water supply forecasting models use simple temperature‐only phase prediction methods, or PPMs, despite the fact that atmospheric conditions like humidity and pressure can also affect precipitation phase. In this study, we compared simple temperature‐only PPMs, with another PPM that included temperature and relative humidity. Relative humidity well‐below 100% acts to cool the falling snowflake through evaporation, similar to how sweating cools people through evaporative heat loss. We show that the different PPMs have relatively similar accuracy compared to observations. This gives confidence that we can hindcast back in time and forecast forward in time using the different PPMs and gridded climate datasets. We show that both hindcasts and forecasts are sensitive to the PPM chosen, with the PPM using relative humidity generally leading to more snowfall than the two temperature‐only PPMs. These results suggest that future declines in relative humidity may be sufficient to buffer declines in snowfall as temperatures warm over the 21st century. Predicting the phase of precipitation is fundamental to water supply and hazard forecasting. Phase prediction methods (PPMs) are used to predict snow fraction, or the ratio of snowfall to total precipitation. Common temperature‐based regression (Dai method) and threshold at freezing (0°C) PPMs had comparable accuracy to a humidity‐based PPM (TRH method) using 6 and 24 h observations. Using a daily climate data set from 1980 to 2015, the TRH method estimates 14% and 6% greater precipitation‐weighted snow fraction than the 0°C and Dai methods, respectively. The TRH method predicts four times less area with declining snow fraction than the Dai method (2.1% and 8.1% of the study domain, respectively) from 1980 to 2015, with the largest differences in the Cascade and Sierra Nevada mountains and southwestern U.S. Future Representative Concentration Pathway (RCP) 8.5 projections suggest warming temperatures of 4.2°C and declining relative humidity of 1% over the 21st century. The TRH method predicts a smaller reduction in snow fraction than temperature‐only PPMs by 2100, consistent with lower humidity buffering declines in snow fraction caused by regional warming. |
Author | Winchell, T. Crews, J. B. Rajagopal, S. Schumer, R. Harpold, A. A. |
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Snippet | Predicting the phase of precipitation is fundamental to water supply and hazard forecasting. Phase prediction methods (PPMs) are used to predict snow fraction,... Abstract Predicting the phase of precipitation is fundamental to water supply and hazard forecasting. Phase prediction methods (PPMs) are used to predict snow... |
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SubjectTerms | 21st century Accuracy Atmospheric conditions Atmospheric models Atmospheric precipitations Buffers Climate Climatic data Economic forecasting Ecosystems Evaporation Evaporative cooling Freezing GCM Heat loss Humidity hydrologic modeling Methods Mountains Precipitation precipitation phase Predictions Rain Relative humidity Snow Snowfall Supply-demand forecasting Sweating Temperature Temperature effects Water supply Weather forecasting |
Title | Relative Humidity Has Uneven Effects on Shifts From Snow to Rain Over the Western U.S |
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