Effects of Vapor-Pressure Deficit and Net-Irradiance Calculation Methods on Accuracy of Standardized Penman-Monteith Equation in a Humid Climate

Yoder, R.; Odhiambo, Lameck O.; Wright, Wesley C.

doi:10.1061/(asce)0733-9437(2005)131:3(228)

Cited by 40 publications

(17 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 2007 growing season exhibited a slightly lower atmospheric evaporative demand as compared with the 25-year averages in June and July, whereas the atmospheric evaporative demand in the 2008 growing season was lower than the long-term average for July, August, and September. Past studies have indicated that a unit change in VPD can result in as much as 10% to 30% change in the estimated reference (potential) ET (Saxton, 1975;Yoder et al, 2005;Irmak et al, 2006 …”

Section: Results and Discussion Weather Conditions During Research Pementioning

confidence: 99%

Hourly and Daily Single and Basal Evapotranspiration Crop Coefficients as a Function of Growing Degree Days, Days After Emergence, Leaf Area Index, Fractional Green Canopy Cover, and Plant Phenology for Soybean

2013

Trans. ASABE

View full text Add to dashboard Cite

Section: Results and Discussion Weather Conditions During Research Pementioning

confidence: 99%

Hourly and Daily Single and Basal Evapotranspiration Crop Coefficients as a Function of Growing Degree Days, Days After Emergence, Leaf Area Index, Fractional Green Canopy Cover, and Plant Phenology for Soybean

2013

Trans. ASABE

View full text Add to dashboard Cite

“…We therefore also calculated VP and VPD for each 10 min measurement period using Eqs. (5), (7), (12), and (14) of Yoder et al (2005). We then calculated mean, daytime mean, nighttime mean, maximum, and minimum VPD on daily and monthly time scales.…”

Section: Humiditymentioning

confidence: 99%

Diurnal, seasonal, and altitudinal trends in microclimate across a tropical montane cloud forest

Rapp¹,

Silman²

2012

Clim. Res.

117

View full text Add to dashboard Cite

Altitudinal gradients are often used as natural laboratories to study ecosystem dynamics, biodiversity, and species' distribution response to climate gradients. However, the underlying climate gradients are rarely described in detail, especially in the tropics. In this study, we describe the diurnal and seasonal patterns in microclimate across a 3900 m altitudinal gradient in and adjacent to the Kosñipata Valley in Manu National Park, Peru, on the eastern slope of the tropical Andes. We focus on the understudied altitudinal range between 1500 and 3500 m using micrometeorological data associated with a permanent tree plot network designed to study cloud forest biodiversity and ecosystem dynamics. Data from this plot network were supplemented with data in the public domain across a 20 000 km 2 area with time series at individual sites lasting from 2 to 17 yr. Observed diurnal and seasonal trends in microclimate variables were explained by diurnal and seasonal variation in solar radiation and atmospheric moisture flux. Altitudinal trends in microclimate varied seasonally, with solar radiation, vapor pressure deficit, and temperature reaching their annual maximum earlier at higher altitudes, likely because of seasonally shifting cloud dynamics. Cloud dynamics were important in determining diurnal, seasonal, and altitudinal trends in several microclimate variables, suggesting that changes to cloud frequency and altitudinal occurrence associated with global climate change could have important impacts on cloud forest ecosystem dynamics, in addition to those of rising temperatures.

show abstract

“…Vapor pressure deficit was calculated using saturation vapor pressure (e s ; Yoder et al 2005, equations 5 and 6) and the actual vapor pressure (e a ; Yoder et al 2005, equation 8), which produces the equation: VPD = e s À e a (Yoder et al 2005). Using temperature (T) and RH data from the HOBO loggers, we calculated average daily values for air temperature and RH.…”

Section: Discussionmentioning

confidence: 99%

“…We also used minimum and maximum daily temperature and RH values to calculate average daily vapor pressure deficit (VPD). Vapor pressure deficit was calculated using saturation vapor pressure (e s ; Yoder et al 2005, equations 5 and 6) and the actual vapor pressure (e a ; Yoder et al 2005, equation 8), which produces the equation: VPD = e s À e a (Yoder et al 2005). Note the actual vapor pressure calculation pairs e s using min T with max RH, and e s using max T with min RH.…”

Section: Discussionmentioning

confidence: 99%

Experimental test of water, nutrients, and microclimate on leaf litter mass loss in headwater riparian forests

Ramey

Richardson

2018

Ecosphere

View full text Add to dashboard Cite

Leaf litter decomposition is an essential function in forest ecosystems, and riparian areas may contribute to faster rates of litter mass loss due to higher moisture and nutrient levels in riparian than upland soils. We experimentally tested whether mass loss of red alder leaf litter was (1) greater closer to the stream than further away and (2) increased by nutrient and water additions in riparian habitat near four headwater streams in southwestern British Columbia. We set up blocks of nine transects extending from the bankfull edge of the stream into upland habitat. Leaf litter bags were placed at 1, 5, 10, 20, and 40 m from the stream along each transect, and data loggers recorded ambient air temperature and relative humidity at each distance. Litterbags received either water or fertilizer additions, both, or neither along each transect. Four trials were run which varied in duration (3 months to 1 yr). Relative humidity was on average 2.6% higher, air temperature 0.25°C lower, and vapor pressure deficit 0.14 kPa lower at 1 m from the stream compared to distances further upland. The addition of water significantly increased litter mass loss by 0.14 g (4%) on average than control litterbags. The addition of fertilizer was a significant factor in some trials but not in others, and its effect on mass loss varied. Although distance from the stream was not a significant parameter in the averaged models for each trial, it was in several top models. We conclude that (1) riparian communities within 1 m of the stream experience a different microclimate during the warmer, drier summer than those communities further upland, though this was not generally reflected in alder mass loss rates, and (2) water was a primary limiting factor to alder leaf mass loss in our study sites.

show abstract

Effects of Vapor-Pressure Deficit and Net-Irradiance Calculation Methods on Accuracy of Standardized Penman-Monteith Equation in a Humid Climate

Cited by 40 publications

References 17 publications

Hourly and Daily Single and Basal Evapotranspiration Crop Coefficients as a Function of Growing Degree Days, Days After Emergence, Leaf Area Index, Fractional Green Canopy Cover, and Plant Phenology for Soybean

Hourly and Daily Single and Basal Evapotranspiration Crop Coefficients as a Function of Growing Degree Days, Days After Emergence, Leaf Area Index, Fractional Green Canopy Cover, and Plant Phenology for Soybean

Diurnal, seasonal, and altitudinal trends in microclimate across a tropical montane cloud forest

Experimental test of water, nutrients, and microclimate on leaf litter mass loss in headwater riparian forests

Contact Info

Product

Resources

About