Presentación realizada en: 19th Symposium on Meteorological Observation and Instrumentation celebrado del 7 al 11 de enero de 2018 en Austin, Texas

Buisán, Samuel

Earle, Michael E.

Kochendorfer, John

Laine, Timo

Landolt, Scott

Nitu, Rodica

Rasmussen, Roy

Reverdin, Audrey

Roulet, Yves-Alain

English

Buisán Sanz, Samuel Tomás

Agencia Estatal de Meteorología

Errors and adjustments for WMO-SPICE tipping-bucket precipitation gaugesJohn Kochendorfer, National Oceanic and Atmospheric AssociationMichael Earle, Environment and Climate Change CanadaAudrey Reverdin, MétéoSuisseRodica Nitu, World Meteorological OrganizationRoy Rasmussen, National Center for Atmospheric ResearchYves-Alain Roulet, MétéoSuisseSamuel Buisan, AEMETScott Landolt, NCARTimo Laine, Finnish Meteorological InstituteWMO-SPICE TestbedsTipping Bucket WMO-SPICE TestbedsSensor Site(s)Reporting  resolution  Maximum   heating power CAE PMB25R CARE, Marshall 0.1 mm 300 WHydrological Services (HSA) TBH CARE, Marshall (x2) 0.2 mm 70 WMeteoservis MR3H-FC CARE, Marshall, Sodankylä 0.1 mm 555 WMeteoservis MR3H-FC, ZAMG CARE, Weissfluhjoch 0.1 mm 555 WThies Precipitation Transmitter, model 5.4032.35.228Formigal 0.2 mm 49 WThies Precipitation Transmitter, model 5.4032.45.008Marshall 0.1 mm 113 WCAEHSA TBHMR3H-FCThiesModel 45.008Double Fence Automated Reference (DFAR)DFARExample transfer functionExample transfer functionExample tipping bucket accumulationsExample tipping bucket accumulationsAnalysis methods affect catch efficiencyEvaluation of CAE transfer functions using continuous measurements from MarshallCAE at Marshall, with a multi-gauge adjustmentCAE at CAREHSA at CAREHSA at MarshallZAMG MR3H at CAREZAMG MR3H at WeissfluhjochMET MR3H at CAREMET MR3H at MarshallMET MR3H at Sodankyla Thies at FormigalThies at MarshallFuture work• Develop a more objective method to select the best transfer function• Develop and test different forms of transfer functions𝐶𝐸 = 𝑒−𝑎 𝑈 1 −tan−1 𝑏 𝑇𝑎𝑖𝑟 +𝑐𝐶𝐸 = 𝑒−𝑎 𝑈+𝑏 1 −tan−1 𝑐 𝑇𝑎𝑖𝑟 +𝑑Wolff et al., 2015Kochendorfer  et al., 20171)2)3)Questions?𝐶𝐸 = 𝑒−𝑎 𝑈 1 −tan−1 𝑏 𝑇𝑎𝑖𝑟 +𝑐𝐶𝐸 = 𝑒−𝑎 𝑈+𝑏 1 −tan−1 𝑐 𝑇𝑎𝑖𝑟 +𝑑Wolff et al., 2015Kochendorfer  et al., 20171)2)3)• Develop a more objective method to select the best transfer function• Develop and test different forms of transfer functionsOutline• Background on precipitation measurements– Tipping buckets are the most prevalent type of automated precip gauge– Photos of gauges and sites (from TB, DFAR as well, wind too?• WMO-SPICE background – map of all sites, map of TB sites?• Background on transfer functions• Challenges specific to tipping bucket measurements – difficult to compare to a standard, delays, missed precip, poor resolution for small snowfall events, sensitivity to time scales, differences in technology– Demonstrate this with a time series plot! We might be able to steal something from the TB report.• What is the standard? What would an ‘ideal’ adjustment look like?– Show the dependence on length of SEDS and ask the question, which one is right?– Show with and without zeros-tip SEDS as well.• For a ‘normal’ weighing gauge we define a time period (event) and compare precip to the standard. For a tipping bucket many ‘events’ are associated with zero tips, and some tips occur after the ‘event’ has ended due to delays in the TB measurement. Excluding 0-tip events will likely over-estimate the catch efficiency, and including them will likely underestimate the catch efficiency.• We  need a validation dataset that can be used to test these transfer functions – a different way of looking at the data. Mimicking operational networks, we created a continuous 1 h dataset that included every tip of the gauge, irrespective of whether it occurred during an actual precip event. We also QA/QC’d the DFAR measurements to create defensible seasonal accumulations.

Errors and adjustments for WMO-SPICE tipping-bucket precipitation gauges

https://repositorio.aemet.es/bitstream/20.500.11765/11614/1/AMS_2018_TB.pdf

Errors and adjustments for WMO-SPICE tipping-bucket precipitation gauges

Abstract

Similar works

Full text

Available Versions

Agencia Estatal de Meteorología