Abstract
Tonle Sap Lake is the largest freshwater lake in Southeast Asia. During the postmonsoon season, a small linear cloud system has been observed over this lake in early morning, while the sky above the surrounding land is clear. Although this cloud system is apparently generated by land breezes, previous studies on land-lake (sea) circulation have suggested that environmental factors at low latitudes inhibit development of nocturnal land breezes. In this study, we investigate the mechanism of these early morning clouds through numerical simulation. The simulations show a linear updraft system over the lake, forming along the southwest lakeshore around 22:00 and moving northeast to the middle of the lake. The heavier air mass from the land meets the extraordinarily warm and humid air mass over the lake, triggering updrafts under the conditionally convective instability. The characteristic high surface water temperature was favorable for generation of the land breeze and updraft systems. That high surface water temperature of the lake is produced by the tropical climate along with efficient energy absorption because of the shallowness of the water body. This unique feature can generate a clear nocturnal land breeze circulation accompanying a migrating updraft system over the lake despite its low latitude. Key Points Land-breeze develops even though this lake is located in the low-latitudes. A lined-up cloud is formed at night over the lake by the very hot lake water. The convection migrates over the lake by the katabatic wind.
| Original language | English |
|---|---|
| Pages (from-to) | 6970-6980 |
| Number of pages | 11 |
| Journal | Journal of Geophysical Research Atmospheres |
| Volume | 118 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - Jul 16 2013 |
| Externally published | Yes |
Fingerprint
Keywords
- land-atmosphere interaction
- land-breeze
ASJC Scopus subject areas
- Atmospheric Science
- Geophysics
- Earth and Planetary Sciences (miscellaneous)
- Space and Planetary Science
Cite this
Land-lake breezes at low latitudes : The case of Tonle Sap Lake in Cambodia. / Tsujimoto, Kumiko; Koike, Toshio.
In: Journal of Geophysical Research Atmospheres, Vol. 118, No. 13, 16.07.2013, p. 6970-6980.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Land-lake breezes at low latitudes
T2 - The case of Tonle Sap Lake in Cambodia
AU - Tsujimoto, Kumiko
AU - Koike, Toshio
PY - 2013/7/16
Y1 - 2013/7/16
N2 - Tonle Sap Lake is the largest freshwater lake in Southeast Asia. During the postmonsoon season, a small linear cloud system has been observed over this lake in early morning, while the sky above the surrounding land is clear. Although this cloud system is apparently generated by land breezes, previous studies on land-lake (sea) circulation have suggested that environmental factors at low latitudes inhibit development of nocturnal land breezes. In this study, we investigate the mechanism of these early morning clouds through numerical simulation. The simulations show a linear updraft system over the lake, forming along the southwest lakeshore around 22:00 and moving northeast to the middle of the lake. The heavier air mass from the land meets the extraordinarily warm and humid air mass over the lake, triggering updrafts under the conditionally convective instability. The characteristic high surface water temperature was favorable for generation of the land breeze and updraft systems. That high surface water temperature of the lake is produced by the tropical climate along with efficient energy absorption because of the shallowness of the water body. This unique feature can generate a clear nocturnal land breeze circulation accompanying a migrating updraft system over the lake despite its low latitude. Key Points Land-breeze develops even though this lake is located in the low-latitudes. A lined-up cloud is formed at night over the lake by the very hot lake water. The convection migrates over the lake by the katabatic wind.
AB - Tonle Sap Lake is the largest freshwater lake in Southeast Asia. During the postmonsoon season, a small linear cloud system has been observed over this lake in early morning, while the sky above the surrounding land is clear. Although this cloud system is apparently generated by land breezes, previous studies on land-lake (sea) circulation have suggested that environmental factors at low latitudes inhibit development of nocturnal land breezes. In this study, we investigate the mechanism of these early morning clouds through numerical simulation. The simulations show a linear updraft system over the lake, forming along the southwest lakeshore around 22:00 and moving northeast to the middle of the lake. The heavier air mass from the land meets the extraordinarily warm and humid air mass over the lake, triggering updrafts under the conditionally convective instability. The characteristic high surface water temperature was favorable for generation of the land breeze and updraft systems. That high surface water temperature of the lake is produced by the tropical climate along with efficient energy absorption because of the shallowness of the water body. This unique feature can generate a clear nocturnal land breeze circulation accompanying a migrating updraft system over the lake despite its low latitude. Key Points Land-breeze develops even though this lake is located in the low-latitudes. A lined-up cloud is formed at night over the lake by the very hot lake water. The convection migrates over the lake by the katabatic wind.
KW - land-atmosphere interaction
KW - land-breeze
UR - http://www.scopus.com/inward/record.url?scp=84880863753&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84880863753&partnerID=8YFLogxK
U2 - 10.1002/jgrd.50547
DO - 10.1002/jgrd.50547
M3 - Article
AN - SCOPUS:84880863753
VL - 118
SP - 6970
EP - 6980
JO - Journal of Geophysical Research
JF - Journal of Geophysical Research
SN - 0148-0227
IS - 13
ER -