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- Title
High Resolution WRF Simulations for the Tel‐Aviv Metropolitan Area Reveal the Urban Fingerprint in the Sea‐Breeze Hodograph.
- Authors
Avisar, D.; Pelta, R.; Chudnovsky, A.; Rostkier‐Edelstein, D.
- Abstract
We implement and verify for the first time four Weather Research and Forecasting model urban configurations, focused on the coastal metropolitan area of Tel‐Aviv (MTA) using updated landuse and morphological maps. We analyze the mesoscale summertime flow and the urban canopy (UC) role in the occurrence of different hodograph dynamics observed within MTA at night. These events may be significant in air quality research. The four configurations—bulk (MM), single‐layer (SLUCM), multilayer (BEP), and BEP coupled with the building energy model—reproduce the observed diurnal temperature and wind cycles, with similar 10‐m wind direction bias and RMSE (≲15° and ∼30°, respectively), with preference for MM and SLUCM at night. However, the SLUCM shows the lowest skill for the 10‐m wind speed (WS) (bias and RMSE ≥1 m s−1), and the BEP shows the largest underestimation of the 2‐m temperature, ∼−2.5 °C. In the SLUCM, the WS increases over an UC and with increasing building heights. These results call for a reexamination of the SLUCM WS parameterization. The simulations show that at night, a convergence line (CL) builds up with the urban heat island, downstream of the NW flow. West of the CL, the wind continues flowing from the sea, and rotates anticlockwise to form a nonelliptical sea‐breeze hodograph. Removing MTA UC restores an elliptical hodograph. East of the CL, the UC supports an elliptical hodograph with a clockwise rotation through the NE sector, previously reported as dynamically unstable. We expect such wind hodograph dynamics within similar coastal metropolitan areas. Key Points: We verify WRF‐urban configurations and analyze summertime flow dynamics over the coastal metropolitan area of Tel‐AvivSensitivity tests for the single‐layer UCM 10m WS suggest that its parameterization be reexaminedA nighttime urban convergence suggests a mechanism for nonelliptical hodographs and supports a flow pattern previously reported unstable
- Subjects
NEMAL Tel-Aviv (Israel); METEOROLOGICAL research; WEATHER forecasting; METROPOLITAN areas; HODOGRAPH
- Publication
Journal of Geophysical Research. Atmospheres, 2021, Vol 126, Issue 5, p1
- ISSN
2169-897X
- Publication type
Article
- DOI
10.1029/2020JD033691