Zobrazeno 1 - 10
of 99
pro vyhledávání: '"Charles A. Helms"'
Autor:
Ali Tokay, Liang Liao, Robert Meneghini, Charles N. Helms, S. Joseph Munchak, David B. Wolff, Patrick N. Gatlin
Publikováno v:
Journal of Applied Meteorology and Climatology. 62:611-624
Parameters of the normalized gamma particle size distribution (PSD) have been retrieved from the Precipitation Image Package (PIP) snowfall observations collected during the International Collaborative Experiment–PyeongChang Olympic and Paralympic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4f72b6c4f901b6629b36c147ae73ae73
https://doi.org/10.1175/jamc-d-21-0266.1
https://doi.org/10.1175/jamc-d-21-0266.1
Publikováno v:
Journal of Hydrometeorology. 24:691-708
Improving estimation of snow water equivalent rate (SWER) from radar reflectivity (Ze), known as a SWER(Ze) relationship, is a priority for NASA’s Global Precipitation Measurement (GPM) mission ground validation program as it is needed to comprehen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ebb4cba2ceb30e9b6eb943fae3e2a5ee
https://doi.org/10.1175/jhm-d-22-0101.1
https://doi.org/10.1175/jhm-d-22-0101.1
Publikováno v:
Atmospheric Measurement Techniques. 15:6545-6561
Measurements of snowflake particle shape are important for studying snow microphysics. While a number of instruments exist that are capable of measuring particle shape, this study focuses on the measurement techniques of three digital video disdromet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::19b48f0156c72aa3d8133f8b8bd37d0b
https://doi.org/10.5194/amt-15-6545-2022
https://doi.org/10.5194/amt-15-6545-2022
Autor:
Lance F. Bosart, Charles N. Helms
Publikováno v:
Monthly Weather Review. 149:2695-2711
On 4–5 September 2013, a relatively shallow layer of northerly dry airflow was observed just west of the core deep convection associated with the low-level center of the pre-Gabrielle (2013) tropical disturbance. Shortly thereafter, the core deep c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::49ec43a099e37dfce38734b1e8699a40
https://doi.org/10.1175/mwr-d-20-0380.1
https://doi.org/10.1175/mwr-d-20-0380.1
Publikováno v:
Journal of Atmospheric and Oceanic Technology. 37:2251-2266
The present study describes methods to reduce the uncertainty of velocity–azimuth display (VAD) wind and deformation retrievals from downward-pointing, conically scanning, airborne Doppler radars. These retrievals have important applications in dat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d760ecfac15a25cdf3c2ac02cee13f43
https://doi.org/10.1175/jtech-d-20-0034.1
https://doi.org/10.1175/jtech-d-20-0034.1
Measurements of snowflake particle size and shape are important for studying the snow microphysics. While a number of instruments exist that are designed to measure these important parameters, this study focuses on the measurement techniques of three
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::459dc4cdc0167a5e59acf0738858c384
https://amt.copernicus.org/preprints/amt-2021-427/
https://amt.copernicus.org/preprints/amt-2021-427/
A method is developed to use both polarimetric and dual-frequency radar measurements to retrieve microphysical properties of falling snow. It is applied to the Ku- and Ka-band measurements of the NASA dual-polarization, dual-frequency Doppler radar (
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::641b6612c5af190f72717216ab2737bd
https://doi.org/10.5194/amt-2021-264
https://doi.org/10.5194/amt-2021-264
Autor:
Robert E. Hart, Charles N. Helms
Publikováno v:
Monthly Weather Review. 143:3109-3135
The processes by which tropical cyclones evolve from loosely organized convective clusters are still poorly understood. Because of the data-sparse regions in which tropical cyclones form, observational studies of tropical cyclogenesis are often more
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1abbb73863f1ba414bcc2900cb673288
https://doi.org/10.1175/mwr-d-14-00242.1
https://doi.org/10.1175/mwr-d-14-00242.1
Autor:
Robert E. Hart, Charles N. Helms
Publikováno v:
Journal of Applied Meteorology and Climatology. 52:1511-1521
Traditional observational analysis of derivative-based variables (e.g., vorticity) usually relies on interpolating observations and evaluating spatial derivatives either on a Cartesian grid or on a spherical grid. Great care must be taken in selectin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ff2518595edd45d68e9fc5dad784c8e6
https://doi.org/10.1175/jamc-d-12-0248.1
https://doi.org/10.1175/jamc-d-12-0248.1