/* DATA DESCRIPTION: Citation: Hoover, Jeffery; Earle, Michael E; Joe, Paul (2021): Unshielded precipitation gauge collection efficiency with wind speed and hydrometeor fall velocity [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.938685 Abstract: Collection efficiency transfer functions that compensate for wind-induced collection loss are presented and evaluated for unshielded precipitation gauges. Three novel transfer functions with wind speed and precipitation fall velocity dependence are developed, including a function from computational fluid dynamics modelling (CFD), an experimental fall velocity threshold function (HE1), and an experimental linear fall velocity dependence function (HE2). These functions are evaluated alongside universal (KUniversal) and climate-specific (KCARE) transfer functions with wind speed and temperature dependence. Transfer function performance is assessed using 30-minute precipitation event accumulations reported by unshielded and shielded Geonor T-200B3 precipitation gauges over two winter seasons. The latter gauge was installed in a Double Fence Automated Reference (DFAR) configuration. Estimates of fall velocity were provided by a Precipitation Occurrence Sensor System (POSS). The CFD function reduced the RMSE (0.08 mm) relative to KUniversal (0.20 mm), KCARE (0.13 mm), and the unadjusted measurements (0.24 mm), with a bias error of 0.011 mm. The HE1 function provided a RMSE of 0.09 mm and bias error of 0.006 mm, capturing well the collection efficiency trends for rain and snow. The HE2 function better captured the overall collection efficiency, including mixed precipitation, resulting in a RMSE of 0.07 mm and bias error of 0.006 mm. These functions are assessed across solid and liquid hydrometeor types and for temperatures between -22 °C and 19 °C. The results demonstrate that transfer functions incorporating hydrometeor fall velocity can dramatically reduce the uncertainty of adjusted precipitation measurements relative to functions based on temperature. Keyword(s): catch efficiency; collection efficiency; precipitation amount; precipitation gauge; Precipitation Occurrence Sensor System; unshielded Supplement to: Hoover, Jeffery; Earle, Michael E; Joe, Paul; Sullivan, Pierre E (2021): Unshielded precipitation gauge collection efficiency with wind speed and hydrometeor fall velocity. Hydrology and Earth System Sciences, 25(10), 5473-5491, https://doi.org/10.5194/hess-25-5473-2021 Further details: Precipitation gauge collection efficiency with wind speed and hydrometeor fall velocity - README (URI: https://download.pangaea.de/reference/111046/attachments/Data_Description_Experiment_20210920.pdf) Coverage: LATITUDE: 44.230000 * LONGITUDE: -79.780000 DATE/TIME START: 2013-11-17T07:30:00 * DATE/TIME END: 2015-04-23T05:00:47 MINIMUM HEIGHT above ground: 2 m * MAXIMUM HEIGHT above ground: 2 m Event(s): CARE_SPICE (CAR, Centre for Atmospheric Research Experiments) * LATITUDE: 44.230000 * LONGITUDE: -79.780000 * DATE/TIME START: 2013-11-17T00:00:00 * DATE/TIME END: 2015-04-23T00:00:00 * ELEVATION: 251.0 m * LOCATION: Canada * CAMPAIGN: SPICE (Solid Precipitation Intercomparison Experiment) (URI: https://library.wmo.int/doc_num.php?explnum_id=5686) * BASIS: Monitoring station * METHOD/DEVICE: Monitoring station (MONS) Parameter(s): DATE/TIME (Date/Time) * GEOCODE * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) HEIGHT above ground [m] (Height) * GEOCODE * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) Precipitation [mm] (Precip) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) * METHOD/DEVICE: DFAR - Double Fence Automated Reference Precipitation [mm] (Precip) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) * METHOD/DEVICE: Unshielded Wind speed [m/s] (ff) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) Temperature, air [°C] (TTT) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) Precipitation description (Precip descr) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) Fall velocity [m/s] (dZ) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) * COMMENT: mode Fall velocity [m/s] (dZ) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) * COMMENT: mean Precipitation [mm] (Precip) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) * METHOD/DEVICE: KUniversal - Universal transfer function * COMMENT: adjusted unshielded Precipitation [mm] (Precip) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) * METHOD/DEVICE: KCARE - Climate-specific transfer function * COMMENT: adjusted unshielded Precipitation [mm] (Precip) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) * METHOD/DEVICE: CFD - Computational fluid dynamics modelling function * COMMENT: adjusted unshielded Precipitation [mm] (Precip) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) * METHOD/DEVICE: HE1 - Experimental fall velocity threshold function * COMMENT: adjusted unshielded Precipitation [mm] (Precip) * PI: Hoover, Jeffery (https://orcid.org/0000-0003-2350-8379, jeffery.hoover@ec.gc.ca) * METHOD/DEVICE: HE2 - Experimental linear fall velocity dependence function * COMMENT: adjusted unshielded License: Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/) Status: Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels) Size: 6168 data points */ Date/Time Height [m] Precip [mm] (DFAR - Double Fence Automated...) Precip [mm] (Unshielded) ff [m/s] TTT [°C] Precip descr dZ [m/s] (mode) dZ [m/s] (mean) Precip [mm] (adjusted unshielded, KUnivers...) Precip [mm] (adjusted unshielded, KCARE - ...) Precip [mm] (adjusted unshielded, CFD - Co...) Precip [mm] (adjusted unshielded, HE1 - Ex...) 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2.122 mixed 2.027 2.408 0.455 0.397 0.504 0.397 0.557 2013-11-22T05:00 2 0.448 0.439 1.784 4.402 rain 4.627 4.337 0.448 0.439 0.440 0.439 0.439 2013-11-22T05:30 2 0.478 0.478 1.957 4.400 rain 5.277 4.839 0.488 0.478 0.479 0.478 0.478 2013-11-22T06:00 2 0.737 0.741 1.890 4.350 rain 6.080 5.734 0.757 0.741 0.741 0.741 0.741 2013-11-22T06:30 2 0.737 0.786 1.917 4.331 rain 6.454 5.948 0.803 0.786 0.786 0.786 0.786 2013-11-22T07:00 2 0.564 0.589 1.960 4.364 rain 6.166 5.734 0.602 0.589 0.589 0.589 0.589 2013-11-22T07:30 2 0.329 0.349 1.521 4.223 rain 5.065 4.782 0.355 0.349 0.349 0.349 0.349 2013-11-22T17:00 2 0.259 0.329 1.630 6.700 rain 5.148 4.697 0.329 0.329 0.329 0.329 0.329 2013-11-23T13:30 2 0.470 0.149 4.410 -2.262 snow 0.972 1.677 0.346 0.238 0.666 0.386 0.504 2013-11-23T21:00 2 0.548 0.150 5.693 -7.988 snow 1.131 1.626 0.526 0.473 0.674 0.721 0.883 2013-11-23T21:30 2 0.493 0.122 5.589 -8.400 snow 1.238 1.727 0.420 0.385 0.392 0.549 0.515 2013-11-23T22:00 2 0.283 0.096 5.343 -8.513 snow 1.178 1.654 0.313 0.289 0.333 0.374 0.395 2013-11-23T22:30 2 0.810 0.280 5.196 -8.702 snow 1.291 1.605 0.885 0.826 0.733 1.011 0.891 2013-11-23T23:00 2 1.189 0.416 4.819 -8.842 snow 1.312 1.633 1.211 1.141 0.970 1.263 1.116 2013-11-23T23:30 2 1.062 0.493 3.631 -8.987 snow 1.298 1.514 1.103 1.059 0.919 0.996 0.942 2013-11-24T00:00 2 1.870 0.822 4.316 -9.705 snow 1.398 1.647 2.149 2.088 1.561 2.057 1.746 2013-11-24T00:30 2 1.268 0.533 3.458 -9.935 snow 1.192 1.387 1.152 1.131 1.078 1.027 1.037 2013-11-24T01:00 2 0.534 0.254 3.822 -10.100 snow 1.093 1.454 0.596 0.586 0.658 0.543 0.591 2013-11-24T19:30 2 0.343 0.226 1.716 -9.228 snow 0.911 1.218 0.331 0.325 0.373 0.297 0.315 2013-11-27T10:00 2 0.845 0.519 3.039 -1.238 snow 1.430 1.518 0.865 0.657 0.785 0.899 0.817 2013-11-28T10:00 2 0.375 0.318 1.259 -9.450 snow 0.888 1.054 0.421 0.416 0.459 0.386 0.403 2013-11-28T10:30 2 0.413 0.365 0.764 -9.263 snow 0.957 1.003 0.433 0.429 0.443 0.408 0.416 2013-11-28T11:00 2 0.379 0.311 0.903 -9.188 snow 0.896 1.023 0.380 0.377 0.400 0.356 0.366 2013-12-01T09:30 2 0.471 0.376 2.005 0.467 snow 1.374 1.383 0.446 0.396 0.501 0.521 0.501 2013-12-01T11:30 2 0.429 0.381 2.117 0.470 mixed 1.508 1.537 0.456 0.402 0.489 0.540 0.501 2013-12-01T12:00 2 0.306 0.226 2.010 0.305 undefined 1.273 1.316 0.273 0.240 0.317 0.314 0.309 2013-12-01T12:30 2 0.422 0.352 2.059 0.333 undefined 1.374 1.419 0.425 0.374 0.473 0.493 0.474 2013-12-01T13:00 2 0.527 0.468 2.272 0.323 mixed 1.701 1.729 0.577 0.501 0.573 0.684 0.599 2013-12-01T13:30 2 0.310 0.290 1.340 0.630 rain 2.369 2.395 0.321 0.298 0.304 0.290 0.306 2013-12-01T14:00 2 0.397 0.419 0.844 0.495 undefined 1.602 1.589 0.450 0.428 0.456 0.475 0.460 2013-12-01T15:00 2 0.251 0.240 0.698 0.705 mixed 2.081 2.110 0.253 0.243 0.249 0.240 0.251 2013-12-01T15:30 2 0.313 0.291 0.510 0.550 undefined 1.822 1.833 0.303 0.294 0.302 0.313 0.304 2013-12-01T16:00 2 0.360 0.364 0.267 0.595 rain 1.428 1.437 0.372 0.366 0.376 0.378 0.376 2013-12-04T08:00 2 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2 0.300 0.081 4.299 -14.710 snow 1.131 1.635 0.214 0.229 0.226 0.202 0.217 2013-12-15T02:00 2 0.387 0.238 2.724 -14.083 snow 1.162 1.356 0.441 0.457 0.418 0.383 0.390 2013-12-15T03:00 2 0.357 0.198 2.946 -13.752 snow 1.147 1.306 0.385 0.399 0.372 0.336 0.345 2013-12-15T03:30 2 0.292 0.132 3.479 -13.818 snow 1.131 1.388 0.290 0.302 0.291 0.256 0.268 2013-12-15T04:00 2 0.384 0.193 2.993 -13.838 snow 1.124 1.366 0.380 0.394 0.377 0.331 0.344 2013-12-15T05:00 2 0.292 0.212 1.597 -13.265 snow 1.048 1.302 0.304 0.309 0.307 0.273 0.281 2013-12-15T05:30 2 0.325 0.240 1.763 -13.273 snow 1.109 1.305 0.357 0.364 0.350 0.318 0.325 2013-12-15T06:00 2 0.274 0.212 1.749 -13.182 snow 1.093 1.319 0.315 0.320 0.311 0.280 0.287 2013-12-16T00:00 2 0.720 0.388 3.081 -6.763 snow 0.934 1.294 0.760 0.694 1.034 0.679 0.779 2013-12-17T09:30 2 0.440 0.212 3.250 -14.745 snow 1.109 1.266 0.443 0.465 0.452 0.387 0.408 2013-12-17T22:30 2 0.306 0.275 1.505 -7.155 snow 0.980 1.013 0.382 0.368 0.405 0.348 0.361 2013-12-17T23:00 2 0.250 0.241 1.482 -7.058 snow 0.911 0.929 0.333 0.320 0.368 0.304 0.319 2013-12-20T06:30 2 0.344 0.255 1.961 -2.200 undefined 1.124 1.167 0.370 0.313 0.386 0.351 0.358 2013-12-20T07:00 2 0.491 0.363 2.007 -2.305 snow 1.390 1.412 0.533 0.450 0.481 0.504 0.482 2013-12-20T07:30 2 0.449 0.349 1.860 -2.222 mixed 1.640 1.612 0.497 0.424 0.418 0.471 0.430 2013-12-20T08:00 2 0.388 0.311 1.249 -2.165 undefined 1.822 1.748 0.394 0.354 0.341 0.376 0.348 2013-12-20T08:30 2 0.418 0.349 1.108 -2.185 undefined 1.541 1.499 0.431 0.392 0.394 0.413 0.398 2013-12-20T09:00 2 0.555 0.506 0.836 -2.140 undefined 2.569 2.472 0.593 0.551 0.517 0.506 0.515 2013-12-20T10:30 2 0.757 0.645 0.832 -1.833 mixed 1.921 1.888 0.751 0.698 0.680 0.729 0.689 2013-12-20T11:00 2 0.508 0.475 1.188 -1.900 mixed 1.752 1.755 0.592 0.533 0.523 0.569 0.533 2013-12-20T11:30 2 0.264 0.275 0.972 -1.926 undefined 1.298 1.334 0.329 0.302 0.320 0.318 0.315 2013-12-20T13:00 2 0.280 0.268 1.644 -1.603 mixed 1.815 1.870 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5.004 4.569 0.803 0.658 0.488 0.487 0.487 2013-12-21T08:00 2 0.283 0.314 2.360 -2.635 mixed 3.037 3.032 0.499 0.412 0.324 0.314 0.314 2013-12-22T01:00 2 0.463 0.340 2.301 -3.498 snow 1.461 1.553 0.544 0.464 0.455 0.500 0.465 2013-12-22T01:30 2 0.795 0.661 1.795 -3.740 snow 1.557 1.627 0.957 0.851 0.804 0.881 0.822 2013-12-22T02:00 2 0.992 0.818 2.019 -3.915 snow 1.503 1.541 1.243 1.094 1.039 1.138 1.061 2013-12-22T02:30 2 0.810 0.708 1.867 -4.075 snow 1.712 1.760 1.045 0.932 0.833 0.957 0.861 2013-12-22T03:00 2 0.755 0.619 2.191 -4.183 snow 1.511 1.582 0.978 0.859 0.801 0.891 0.822 2013-12-22T03:30 2 0.386 0.317 2.222 -4.275 snow 1.503 1.622 0.505 0.444 0.413 0.459 0.424 2013-12-22T04:00 2 0.496 0.497 2.904 -4.266 mixed 3.268 3.229 0.913 0.770 0.511 0.497 0.497 2013-12-22T04:30 2 0.293 0.339 3.328 -4.037 rain 4.108 4.034 0.677 0.552 0.342 0.339 0.339 2013-12-22T05:00 2 0.910 0.890 3.178 -4.168 rain 5.829 5.524 1.728 1.430 0.891 0.890 0.890 2013-12-22T05:30 2 0.911 0.909 2.755 -4.290 rain 4.860 4.607 1.619 1.379 0.912 0.909 0.909 2013-12-22T06:00 2 1.178 1.120 2.424 -4.455 rain 5.153 5.001 1.865 1.629 1.122 1.120 1.120 2013-12-22T06:30 2 1.905 1.893 2.189 -4.502 rain 4.640 4.851 3.001 2.659 1.899 1.893 1.893 2013-12-22T07:00 2 1.662 1.675 2.182 -4.610 rain 4.611 4.692 2.654 2.360 1.681 1.675 1.675 2013-12-22T07:30 2 1.739 1.798 2.234 -4.800 rain 4.290 4.408 2.887 2.574 1.808 1.798 1.798 2013-12-22T08:00 2 1.151 1.108 2.383 -4.800 rain 5.475 5.116 1.836 1.624 1.109 1.108 1.108 2013-12-22T10:30 2 0.414 0.433 2.569 -4.520 mixed 2.199 2.442 0.744 0.646 0.484 0.433 0.501 2013-12-22T11:30 2 0.860 0.758 3.621 -4.175 mixed 2.627 2.658 1.615 1.301 0.826 0.758 0.804 2013-12-22T12:00 2 0.616 0.512 4.118 -3.945 mixed 2.553 2.691 1.203 0.929 0.571 0.512 0.564 2013-12-22T12:30 2 0.351 0.267 4.394 -4.110 mixed 2.400 2.521 0.667 0.512 0.309 0.267 0.317 2013-12-22T13:00 2 0.930 0.802 4.154 -4.268 mixed 2.649 2.743 1.914 1.502 0.883 0.802 0.851 2013-12-22T13:30 2 0.503 0.363 3.920 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0.264