 |
| Titel |
Estimation of atmospheric mixing layer height from radiosonde data |
| VerfasserIn |
X. Y. Wang, K. C. Wang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 6 ; Nr. 7, no. 6 (2014-06-12), S.1701-1709 |
| Datensatznummer |
250115818
|
| Publikation (Nr.) |
 copernicus.org/amt-7-1701-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Mixing layer height (h) is an important parameter for
understanding the transport process in the troposphere, air pollution,
weather and climate change. Many methods have been proposed to determine
h by identifying the turning point of the radiosonde
profile. However, substantial differences have been observed in the existing
methods (e.g. the potential temperature (θ), relative humidity
(RH), specific humidity (q) and atmospheric refractivity (N) methods). These
differences are associated with the inconsistency of the temperature and
humidity profiles in a boundary layer that is not well mixed, the changing
measurability of the specific humidity and refractivity with height, the
measurement error of humidity instruments within clouds, and the general
existence of clouds. This study proposes a method to integrate the
information of temperature, humidity and cloud to generate a consistent
estimate of h. We apply this method to high vertical
resolution (~ 30 m) radiosonde data that were collected at 79
stations over North America during the period from 1998 to 2008. The data
are obtained from the Stratospheric Processes and their Role in Climate Data
Center (SPARC). The results show good agreement with those from N method as the
information of temperature and humidity contained in N; however, cloud effects
that are included in our method increased the reliability of our estimated
h. From 1988 to 2008, the climatological
h over North America was 1675 ± 303 m with a strong
east–west gradient: higher values (generally greater than 1800 m) occurred
over the Midwest US, and lower values (usually less than 1400 m) occurred
over Alaska and the US West Coast. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|