Abstract. Aeolus is the first satellite mission to directly observe wind profile information on a global scale. After implementing set of bias corrections, data products went public 12 May 2020. However, over China have thus far not been evaluated extensively by ground-based remote sensing measurements. In this study, Mie-cloudy and Rayleigh-clear from measurements are validated against observations radar profiler (RWP) network in China. Based position each RWP site relative closest ground...

The Tibetan Plateau houses numerous lakes, the phenology and duration of lake ice in this region are sensitive to regional global climate change, as such used key indicators change research, particularly environment comparison studies for Earth three poles. However, due its harsh natural sparse population, there is a lack conventional situ measurement on phenology. Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Snow Index (NDSI) data, which can be traced back 20...

Abstract. Wind profiles are fundamental to the research and applications in boundary layer meteorology, air quality numerical weather prediction. Large-scale wind profile data have been previously documented from network observations several countries, such as Japan, USA, various European countries Australia, but nationwide poorly understood China. In this study, salient characteristics performance of observed by radar profiler China investigated. This consists more than 100 stations...

Analyses of landfast ice in Arctic coastal areas provide a comprehensive understanding the variations sea and generate data for studies on utilization passages. Based our analysis, mainly appears January–June is distributed within narrow straits Canadian Archipelago (nearly 40%), East Siberian Sea, Laptev Kara Sea. From 1976–2018, extent gradually decreased at an average rate −1.1 ± 0.5 × 104 km2/yr (10.5% per decade), while decrease entire was −6.0 2.4 (5.2% decade). The annual maximum...

Semantic segmentation of standing trees is important to obtain factors from images automatically and effectively. Aiming at the accurate multiple in complex backgrounds, some traditional methods have shortcomings such as low accuracy manual intervention. To achieve tree effectively, SEMD, a lightweight network model based on deep learning, proposed this article. DeepLabV3+ chosen base framework perform multi-scale fusion convolutional features images, so reduce loss image edge details during...

This paper investigates the distribution of spatial modes cloud-to-ground (CG) lightning activity across China's land areas during period 2010–20 and their possible causes based on CG dataset China National Lightning Detection Network. It is found that first empirical orthogonal function mode (EOF1) occupies 32.86% total variance summer anomaly variation. Also, it exhibits a negative–positive–negative meridional seesaw pattern from north to south. When SST East Pacific Indian Ocean warms...

Abstract. Vertical wind profiles are the foundation for numerical weather prediction systems research. Large-scale vertical data have been previously documented from network observations in several countries, but nationwide poorly understood China. In this study, salient characteristics and performance of winds as observed by radar profiler China was investigated, which consists more than 100 stations instrumented with 1290-MHz Doppler designed primarily measuring vertical-resolved winds....

Atmospheric transmittance is an important factor for atmospheric correction in the inversion of land surface parameters. Under nonprecipitating conditions, microwave X-, Ku-, and Ka-bands mainly determined by oxygen, water vapor, cloud liquid content. In this letter, radiosoundings from 119 stations China, performed twice a day January 2011 to July 2014, were used Salonen-Uppala detection algorithm distinguish layers layered profiles estimate content therein. The resulting transmittances at...

Abstract. Aeolus is the first satellite mission to directly observe wind profile information on a global scale. After implementing set of bias corrections, data products has gone public 12 May 2020. However, over China were thus far not evaluated by in-situ comparison. In this study, Mie-cloudy and Rayleigh-clear from measurements are validated against observations radar profiler (RWP) network in China. Based position each RWP site relative closest ground tracks, three matchup categories...

Variable atmospheric conditions are typically ignored in the retrieval of geophysical parameters Earth's surface when using spaceborne passive microwave observations. However, high frequencies, for example, 91.7 GHz, sensitive to variable absorption, even winter's dry conditions. In this article, influence absorption on snow cover extent (SCE) mapping was quantitatively investigated. A physical method derived enable correction The total column precipitable water vapor (TPWV) from Moderate...

Abstract. The European Space Agency (ESA) Earth Explorer Atmospheric Dynamics Mission Aeolus is the first satellite mission providing wind profile information on a global scale, and its products have been released 12 May 2020. Here we verify intercompare observations from ESA’s Centre for Medium-Range Weather Forecasts (ECMWF) fifth generation atmospheric reanalyses (ERA5) with radiosonde (RS) over China, to allow fitting application of winds. provides in aerosol-free (referred as...

The High Mountain Asia (HMA) region, ranging from the Hindu Kush and Tien Shan in west to Himalaya south with an altitude between 2000 8844 m, holds largest reservoir of glaciers snow outside Earth Polar Regions. In last decades, numerous lake areas there have undergone tremendous changes water redistribution. order increase understanding pattern distribution resources, their dynamic at basin scale, a watershed classification based on replenishment patterns dataset was constructed. input are...

Ice surface albedo is an important factor in various optical remote sensing technologies used to determine the distribution of snow or melt water on ice, and judge formation melting lake ice winter, especially cold arid areas. In this study, field measurements were conducted at Wuliangsuhai Lake, a typical semi-arid area China, investigate diurnal variation albedo. Observations showed that variations exhibit bimodal characteristics with peaks occurring after sunrise before sunset. The curve...

Abstract Lake-ice phenology is one of the key cryosphere indicators. Based on changes in time series daily lake ice coverage and microwave brightness temperature, two machine-learning methods were selected for estimating ice. Using MODIS series, a convolutional neural network (CNN) was used to automatically classify lakes as either having or not regular freezing signatures. The classification results compared test samples accuracies 91% 100% found that do freeze annually, respectively. In...

With the development of computer vision technology, its applications in forestry are steadily becoming wider. To address problems inconvenience transporting unmanned aerial vehicles (UAVs), as well complex operation large instruments for measurement, a new method based on multi-vision image segmentation and coordinate fusion (MISF) is proposed this paper measuring size standing trees. In MISF, after images tree captured using camera from multiple angles, semantic deep learning used to...

This paper measures the twenty one geometric errors of numerical control machining center with parameter identification through laser interferometer, main contents illustrate measurement system, model and some testing results combined specific experimental conditions, at same time provide particular reference value on machine tool(NC tool) precision detection.

Among clean energy transformation devices, fuel cells have gained special attention over the past years; however, advancing appropriate non-valuable metal impetuses to halfway supplant customary Pt/C impetus is still in progress. In this paper, we propose a specific electrocatalyst formula of highly-active Cu species, associated with coated carbon (Cu@C-800), for oxygen reduction reaction (ORR) through post-treatment self-assembled precursor. The optimized catalyst Cu@C-800 showed excellent...

In response to the cultural development strategy put forward by my country in past two years, this paper combines virtual reality technology with unique rendering technology, uses texture mapping construct city roaming scenes, ray tracing algorithm creates various lighting effects, and dynamic image realizes images Sharpen, automatically adjust brightness of texture. Through above ancient style modernity are merged create a quiet elegant future architectural scene.

Passive microwave remote sensing has all-weather work capabilities, but atmospheric media have different influences on satellite brightness temperature under conditions and environments. In order to clarify Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E), radiation were simulated based AMSR-E configuration clear sky cloudy conditions, by using radiative transfer model data. Results showed that water vapor was the major factor for condition. Atmospheric transmittances...