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Su-Ping Zhang, Shang-Ping Xie, Qin-Yu Liu, Yu-Qiang Yang, Xin-Gong Wang, and Zhao-Peng Ren

1. Introduction Sea fog often causes shipwrecks and disrupts transportation and other socioeconomic activities over the ocean and in coastal regions. The Yellow Sea experiences heavy fog over a significant fraction of the year. Figure 1 shows the number of fog days as a function of calendar month based on 30 yr of station observations. Stations on the northwest (NW) Yellow Sea coast typically record more than 50 foggy days a year while the maximum of over 80 days is found at Chengshantou (CST

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Michael B. Meyer and G. Garland Lala

MAY1990 MICHAEL B. MEYER AND G. GARLAND LALA 577Climatological Aspects of Radiation Fog Occurrence at Albany, New York MICHAEL B. MEYER AND G. GARLAND LALAAtmospheric Sciences Research Center, State University of New York at Albany, Albany, New York(Manuscript received 6 September 1988, in final form 28 November 1989)ABSTRACT We present a detailed investigation of the local radiation fog climatology

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Ryan Eastman and Stephen G. Warren

observations is available through the Carbon Dioxide Information Analysis Center (CDIAC) as dataset NDP-026C ( ). Using the EECRA we created a climatology of averaged cloud amounts. The 27 cloud types of the synoptic code have been grouped into nine types for our analyses. The nine types include a single high (cirriform) type, three middle types (nimbostratus, altostratus, and altocumulus), and the five low types that are the focus of this study [fog

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Naoya Takahashi and Tadahiro Hayasaka

adv in the NP. Their results showed that warm advection in summertime NP enhances optically thick and high-level cloud, fog, and stratus, as observed by satellite and ship-based observation; in contrast, the cold advection produces favorable conditions for low-level cloud, in particular stratocumulus and cumulus. The mechanism of LCC enhancement with cold advection over a warm sea surface is related with the processes that destabilizes lower atmosphere near the sea surface and enhances turbulent

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Tsuyoshi Koshiro, Seiji Yukimoto, and Masato Shiotani

LSC amounts and EISs over the subtropical and midlatitude oceans. LSCs are composed of three types: stratocumulus (Sc), stratus (St), and sky-obscuring fog (FOG). These occur through distinctly different meteorological processes ( Norris 1998a , b ; Norris and Klein 2000 ). Koshiro and Shiotani (2014 , hereafter KS14 ) investigated climatological seasonal relationships between the amounts of each LSC type and EISs over the global ocean. They found that the relationships are clearly divided into

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John M. Hanesiak and Xiaolan L. Wang

. 2001 ; Walsh et al. 1996 ; Serreze et al. 1997 ). All of these studies point to significant climatic variations and trends in related climate variables. However, there is limited trend information in other adverse-weather events, such as freezing precipitation (FZ), blowing snow (BS), fog, and low ceiling (LC) conditions, particularly in the Arctic. It is the goal of this study to assess the observed changes in the frequency of these four types of adverse weather in the Canadian Arctic. The

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Thomas M. Seidel, Andrea N. Grant, Alexander A. P. Pszenny, and Daniel J. Allman

values are treated as suspect since psychrometric calculations have changed over time. As described below, this study recalculates these data to insure consistency. Current Observatory procedure requires T and T w observations only if the station is not fog bound. If the station is reporting fog (visibility less than 1 km) then T is read from the meniscus of an ‘alcohol-in-glass’ minimum thermometer. Under this condition both T w and T d are set equal to T . Visual inspection of the

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Stephen A. Klein and Dennis L. Hartmann

of maximum stratus corresponds to the season of greatest lowertroposphere static stability, lnterannual variations in stratus cloud amount also are related to changes in staticstability. A linear analysis indicates that a 6% increase in stratus fractional area coverage is associated with each1 °C increase in static stability. Over midlatitude oceans, sky-obscuring fog is a large component of the summertimestratus amount. The amount of fog appears to be related to warm advection across sharp

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Hiroki Tokinaga, Youichi Tanimoto, Shang-Ping Xie, Takeaki Sampe, Hiroyuki Tomita, and Hiroshi Ichikawa

, forming sea fog in summer. Unfortunately, coarse spatial resolution (>2° × 2° grid) of ship-based cloud and other atmospheric datasets used in these studies was too coarse to detect imprints of narrow SST fronts on the atmosphere. Tanimoto et al. (2009) use high-resolution surface meteorological observations and atmospheric soundings during the Kuroshio Extension System Study (KESS) ( Donohue et al. 2008 ) cruise in 2005 and show a sharp cross-frontal transition of low clouds. Their cloud-base height

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Youichi Tanimoto, Shang-Ping Xie, Kohei Kai, Hideki Okajima, Hiroki Tokinaga, Toshiyuki Murayama, Masami Nonaka, and Hisashi Nakamura

saturated specific humidity, respectively ( Figs. 4b and 4e ). Figure 5 displays a typical sounding at station A4 (black curves). The surface inversion was about 150 m thick. The atmosphere was saturated from the surface to 800 m, indicating the formation of a thick fog layer. Dewpoint temperatures in the lower MABL were nearly uniform meridionally between A4 (black dashed line in Fig. 5 ) and farther upwind (e.g., at A9; gray dashed line in Fig. 5 ), while the air temperature at A4 was typically

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