Search Results

You are looking at 1 - 10 of 39 items for :

  • Seasonal effects x
  • Climate Implications of Frontal Scale Air–Sea Interaction x
  • All content x
Clear All
Kohei Takatama, Shoshiro Minobe, Masaru Inatsu, and R. Justin Small

long-term model experiment focusing on the Gulf Stream region. Here we treat the annual mean and the seasonal cycle of the atmospheric response in this region. Furthermore, we attempt to apply our diagnostics to other western boundary currents, even where the dataset is limited and we therefore cannot fully diagnose the response, and we discuss the generality of the diagnostics in regard to air–sea interactions in the midlatitudes. The remainder of the present paper is organized as follows. The new

Full access
Ayumu Miyamoto, Hisashi Nakamura, and Takafumi Miyasaka

midtropospheric subsidence, which acts to warm the free troposphere, maintains a strong temperature inversion at the top of the boundary layer, inhibiting cloud-top entrainment of dry air. In fact, the temperature inversion can explain seasonality of low-cloud fraction (LCF) in the eastern portion of an ocean basin ( Klein and Hartmann 1993 ; Wood and Bretherton 2006 ). Those equatorward surface winds yield cold advection, thus destabilizing the surface layer, and thereby facilitating shallow convection in

Open access
Akira Kuwano-Yoshida, Bunmei Taguchi, and Shang-Ping Xie

. Tomita , and H. Ichikawa , 2009 : Ocean frontal effects on the vertical development of clouds over the western North Pacific: In situ and satellite observations . J. Climate , 22 , 4241 – 4260 . Ueda , H. , and T. Yasunari , 1996 : Maturing process of the summer monsoon over the western North Pacific: A coupled ocean/atmosphere system . J. Meteor. Soc. Japan , 74 , 493 – 508 . Ueda , H. , T. Yasunari , and R. Kawamura , 1995 : Abrupt seasonal change of large-scale convective

Full access
Hyodae Seo, Arthur J. Miller, and Joel R. Norris

the isotherms of 10°, 12°, and 14°C. Figure 6 shows a year-round time series of the monthly mean surface EKE averaged over 32°–45°N and 130°–120°W ( Fig. 4b ). The EKE levels have a strong seasonal cycle with the maxima in summer and the minima in winter. The EKE in CTL (red) and noT e (orange) are again similar in both seasons, while the runs without ocean current effects (blue to green curves), whether background or eddy, all display the higher EKE. It is interesting to note that the EKE

Full access
Shinichiro Kida, Bo Qiu, Jiayan Yang, and Xiaopei Lin

been insufficient to describe seasonal changes at all three straits, especially at the Soya Strait ( Fukamachi et al. 2008 ). Among the three straits, the Tsushima Strait is the most frequently observed [see Teague et al. (2006) and reference therein]. Past direct measurements reveal an annual cycle at the Tsushima Strait with a maximum transport from late summer to early fall and a minimum transport in winter ( Fig. 2a ; Fukudome et al. 2010 ). The amplitude of seasonal cycle in transport is

Full access
Fumiaki Ogawa and Thomas Spengler

sensible (SSHF) and latent heat fluxes (SLHF). We use T d 2 to calculate specific humidity ( q 2 ) at 2 m. The surface fluxes at the four analysis times were derived using the accumulated surface fluxes from the 0000 UTC (1200 UTC) ERA-Interim forecasts between +3 and +9 as well as +9 and +15 to calculate the 0600 and 1200 UTC (1800 and 0000 UTC) analysis, respectively. We calculated daily, weekly, and monthly means based on the 6-hourly data and derived annual as well as seasonal means for December

Open access
Peter Gaube, Dudley B. Chelton, Roger M. Samelson, Michael G. Schlax, and Larry W. O’Neill

been recognized theoretically ( Stern 1965 ). However, direct observations of these two effects on surface currents could not be obtained before the advent of satellite scatterometers. The first observations of the effects of eddy surface currents on the relative wind (and by inference, the surface stress) were reported by Cornillon and Park (2001) from scatterometer measurements over Gulf Stream rings (see also Park et al. 2006 ). More recently, McGillicuddy et al. (2007) and Ledwell et al

Full access
Adèle Révelard, Claude Frankignoul, Nathalie Sennéchael, Young-Oh Kwon, and Bo Qiu

the same results (not shown). Also, the same analysis was conducted for seasonal means, and the results are identical. A significant asymmetry is found in the large-scale atmospheric response, but much less in the local features. The SST anomaly in the KOE region is roughly symmetric in pattern and amplitude, although the negative anomaly is more longitudinally extended ( Figs. 11a,b ). There are also clear effects of the oceanic eddy activity. During the positive state, eddy activity is much

Full access
Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, and Akira Kuwano-Yoshida

the United States and southern Canada. For this purpose, a pair of ensemble AGCM experiments has been conducted, paying attention to the seasonal evolution of the background westerlies and migratory eddy activity. In addition, the importance of the midlatitude SST anomalies in forcing the atmospheric anomalies is assessed relative to the remote influence from La Niña–like cool SST anomalies in the tropical Pacific ( Fig. 1e ), whose importance for warm-season precipitation anomalies over North

Full access
Hyodae Seo

southwestern Arabian Sea and its relation to the seasonal circulation . Deep-Sea Res. II , 50 , 2129 – 2141 , doi: 10.1016/S0967-0645(03)00049-3 . 10.1016/S0967-0645(03)00049-3 Carton , J. A. , and B. S. Giese , 2008 : A reanalysis of ocean climate using Simple Ocean Data Assimilation (SODA) . Mon. Wea. Rev. , 136 , 2999 – 3017 , doi: 10.1175/2007MWR1978.1 . 10.1175/2007MWR1978.1 Chelton , D. B. , 2013 : Ocean–atmosphere coupling: Mesoscale eddy effects . Nat. Geosci. , 6 , 594 – 595

Full access