Temporal variability of the vertical structure of the sea temperature field and its relationship with atmospheric processes according to observation data

2021 ◽  
Author(s):  
Sergey I. Kazakov
Keyword(s):  
Temperature Field ◽  
Temporal Variability ◽  
Vertical Structure ◽  
Observation Data ◽  
Sea Temperature ◽  
Atmospheric Processes

Relationship between Sea Temperature Change and Tropical Cyclones Based on Argo

2011 ◽  
Vol 250-253 ◽  
pp. 2782-2786
Author(s):  
Jiong Zhu ◽  
Jian Cheng Kang
Keyword(s):  
Water Temperature ◽  
Sea Water ◽  
Interpolation Method ◽  
Observation Data ◽  
Continuous Change ◽  
Weighted Interpolation ◽  
Sea Temperature ◽  
Actual Observation ◽  
Distance Weighted ◽  
Inverse Distance Weighted Interpolation

The relationship between sea water temperature with depth and the maximum cyclone wind speed was analyzed, the temperature was acquired before 24h of the cyclones occurred by using of data of Argo floats and cyclones in 2005, and taking advantage of inverse distance weighted interpolation method. The results showed that: (1) the Tropical Cyclone’s intensity had a strong correlation with the sea water temperature in the depth of about 42m or so. (2) Under the conditions of similar latitude, according to the energy conservation law, the maximum intensity of cyclones wind was a linear function of sea water temperature, depth, and continuous change in the overall rate, which was verified through the actual observation data.

Investigation of the Vertical Structure of Warm-Cloud Microphysical Properties Using the Cloud Evolution Diagram, CFODD, Simulated by a Three-Dimensional Spectral Bin Microphysical Model

2012 ◽  
Vol 69 (6) ◽  
pp. 2012-2030 ◽  
Author(s):  
Yousuke Sato ◽  
Takashi Y. Nakajima ◽  
Teruyuki Nakajima
Keyword(s):  
Vertical Structure ◽  
Three Dimensional ◽  
Global Scale ◽  
Observation Data ◽  
Time Step ◽  
Microphysical Properties ◽  
Warm Cloud ◽  
Dominant Process ◽  
Microphysical Processes ◽  
Cloud Evolution

Abstract This paper investigates the vertical structure of warm-cloud microphysical properties using a three-dimensional (3D) spectral bin microphysical model. A time series of contoured frequency by optical depth diagrams (CFODDs), which were proposed by previous studies, are calculated for the first time by a 3D model assuming two types of aerosol conditions (i.e., polluted and pristine). This contrasts with previous studies that obtained CFODDs using either a two-dimensional model or an accumulation of monthly and global observation data. The results show that the simulated CFODDs are characterized by distinctive patterns of radar reflectivities, similar to the patterns often observed by satellite remote sensing, even though the calculation domain of this study is limited to an area of 30 × 30 km2, whereas the satellite observations are of a global scale. A cloud microphysical box model is then applied to the simulated cloud field at each time step to identify the dominant process for each of the patterns. The results reveal that the wide variety of satellite-observed CFODD patterns can be attributed to different microphysical processes occurring in multiple cloud cells at various stages of the cloud life cycle.

The Vertical Structure of Eddy Heat Transport Simulated by an Eddy-Resolving OGCM

2010 ◽  
Vol 40 (2) ◽  
pp. 340-353 ◽  
Author(s):  
Bo Young Yim ◽  
Yign Noh ◽  
Bo Qiu ◽  
Sung Hyup You ◽  
Jong Hwan Yoon
Keyword(s):  
Heat Transport ◽  
Mixed Layer ◽  
General Circulation ◽  
Vertical Structure ◽  
Mixed Layer Depth ◽  
Circulation Model ◽  
Ocean General Circulation Model ◽  
Spatial And Temporal Variation ◽  
Observation Data ◽  
Eddy Heat Transport

Abstract The vertical structure of meridional eddy heat transport (EHT) of the North Pacific was investigated by analyzing the results from an eddy-resolving ocean general circulation model (OGCM) with a horizontal resolution of , while comparing with previous simulation results and observation data. In particular, the spatial and temporal variation of the effective depth of EHT He was investigated, which is defined by the depth integrated EHT (D-EHT) divided by EHT at the surface. It was found that the annual mean value of He is proportional to the eddy kinetic energy (EKE) level at the surface in general. However, its seasonal variation is controlled by the mixed layer depth (MLD) in the extratropical ocean (>20°N). Examination of the simulated eddy structures reveals that the temperature associated with mesoscale eddies is radically modified by the surface forcing in the mixed layer, while the velocity field is not, and the consequent enhanced misalignment of temperature and velocity anomalies leads to the radical change of EHT across the seasonal thermocline.

scholarly journals Study of temporary variability of vertical structure parameters of water in the coastal zone of southern Crimea

2021 ◽  
Vol 27 (3) ◽  
pp. 49-58
Author(s):  
Sergey Kazakov
Keyword(s):  
Coastal Zone ◽  
Temporal Variability ◽  
Vertical Structure ◽  
Subsurface Layer ◽  
Measurement Data ◽  
Lower Boundary ◽  
Wind Component ◽  
Vertical Temperature ◽  
Vertical Temperature Profile ◽  
Upwelling And Downwelling

The issues of the formation and temporal variability of the vertical structure of the Black Sea waters off the coast of the southern Crimea are considered. A large array of instrumental measurement data obtained in the second half of 2013 (June–December) during operational monitoring of the vertical temperature profile in the area of Stationary oceanographic platform of the Marine Hydrophysical Institute in the coastal zone near Cape Kikineiz is used. The measurements were carried out using a thermoline, which is a system of temperature sensors distributed in depth from the surface to the bottom. To study the vertical structure of the temperature field, a model of two-layer stratification is considered, when two quasi-homogeneous layers (the upper one is warmer and the lower one cold) are separated by a layer of large vertical temperature gradients—the thermocline. A number of parameters of the vertical structure of waters were calculated: the vertical temperature gradient, its maximum values and depth of occurrence, the temperature of the thermocline core (if it was recorded) and quasi-uniform layers, the temperature difference between these layers, and the thermocline thickness. The median estimates of the daily values of the listed parameters are analyzed. Specific cases of transformation of the vertical profile of water temperature during the upwelling and downwelling processes are considered. It is shown that the temporal variability of the parameters of the vertical structure is significant, especially in the summer hydrological season. The main contribution to the variability is caused by the seasonal course of the heat flow from the atmosphere through the sea surface and surge processes (upwelling and downwelling) in the summer period caused by abrupt changes in the alongshore wind component. In the autumn hydrological season, the thermocline is recorded sporadically with a slight gradient in the form of the lower boundary of the subsurface layer of daytime heating, or a thin bottom layer.

scholarly journals Current state and tendencies of distribution of ground frosts within the territory of Ukraine

2017 ◽  
pp. 37-42
Author(s):  
S. V. Klok
Keyword(s):  
Temperature Field ◽  
Air Temperature ◽  
Extreme Values ◽  
Negative Impact ◽  
Observation Data ◽  
Current State ◽  
Weather Phenomenon ◽  
Minimum Air Temperature ◽  
Observation Period ◽  
Made In

The purpose of this work consists in identifying the main trends of present-day formation and distribution of ground frosts throughout Ukraine. For this purpose the analysis of a minimum air temperature field has been conducted based on observation data at 186 stations of Ukraine for the period from 1991 to 2014. It is known that extreme values of air temperature are much more informative than its average values. Therefore analyses of meteorological extreme values usually lead to more substantial and qualitative results. In the course of the work, occurrences of frost in April, May and September have been studied separately from each other while these three months are deemed to be the most dangerous in terms of frosts' frequency and negative impact. In order to identify trends to occurrence of this dangerous weather phenomenon a comparison of two decades of 1991-2000 and 2001-2010 has been made. In addition, the latest observation period of 2011-2014 has been considered separately taking into account the results of comparative analysis of two preceding decades. The results of the work indicate a decrease of number of September days having this dangerous weather phenomenon during the last few years. However, recurrence of frosts remains stably high in April while in May it appears to be high only in certain years. The obtained results also indicate the fact that the northern and northeastern territories of Ukraine appear to be the most vulnerable to frosts. Thus it should be noted that a threat of adverse consequences caused by ground frosts is still there and remains to be quite high, especially for agriculture.

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