This study provides a new conceptional framework to understand the life cycle of floe size distribution Arctic sea ice and associated processes. We derived from selected multi-scale satellite imagery data acquired different locations times in Arctic. Our identifies three stages evolution during summer - 'fracturing', 'transition' 'melt/wave fragmentation'. Fracturing defines initial (

Abstract. Sea ice is composed of discrete units called floes. Observations show that these floes can adopt a range sizes spanning orders magnitude, from metres to tens kilometres. Floe size impacts the nature and magnitude interactions between sea ice, ocean, atmosphere including lateral melt rate momentum heat exchange. However, large-scale geophysical models employ continuum approach traditionally either assume constant or do not include an explicit treatment floe size. In this study we...

Rapidly and accurately extracting water body information from remote sensing satellite images is critical for the investigation of resources, planning watershed, dynamically monitoring, environment conservation, etc. With an image Landsat-7 ETM+ in Lushan Mountain region, spectral characteristics other main surface features were analyzed paper. A method modified normalized difference index (MNDWI) combined with K-T transformation was proposed to distinguish mountain shadow. First, MNDWI...

Marginal seas are fundamental to humans for their importance in mariculture resources and commerce. Based on the NOAA 0.25 degree daily Optimum Interpolation (OI) sea surface temperature (SST) data set, spatiotemporal changes mean extreme SST East China Seas (ECSs) were examined from 1982 2017. As a regional average, annual has notably increased at rate of 0.21 ± 0.08 °C per decade. The warming during 1982–2017 is probably related influence recent strengthening westward extension WPSH. There...

Based on the operational regional ensemble prediction system (REPS) in China Meteorological Administration (CMA), this paper carried out comparison of two initial condition perturbation methods: an transform Kalman filter (ETKF) and a dynamical downscaling global perturbations. One month consecutive tests are implemented to evaluate performance both methods REPS environment. The characteristics analyzed forecast verifications conducted; furthermore, TC case is investigated. main conclusions...

Oceanographic data collected during seismic surveys have potential to provide a significant resource for oceanographic research. In this paper, acoustic Doppler current profiler (ADCP) the Chevron 2011 North East Grand Banks survey are analysed. The took place in 32,000-km2 area banks, Orphan Basin region water depths ranging from 100 1500 m and notably, is crossed by offshore branch of Labrador current. Data quality evaluated comparing velocities before after ship turns where we find no...

摘要:

Abstract. Size distribution of sea ice floes is an important component for thermodynamic and dynamic processes, particularly in the marginal zone. Recently processes related to floe size (FSD) have been incorporated into models, but sparsity existing observations limits evaluation FSD thus hindering model improvements. In this study, perimeter density has applied characterise evaluating three models – Waves-in-Ice module Power law Floe Distribution (WIPoFSD) two branches a fully prognostic...

Image segmentation is the foundation of object-based and automatic interpretation remote sensing images , but high-resolution image data generally large, for this problem, traditional approach processing in sub-block, then merge results, because complexity nature object, merging result not satisfied, algorithm often more complex to calculate time-consuming, it affect real-time. In paper, we propose a parallel based on pyramid image, first all, create segment with initial homogeneous regions...

Abstract. The sea ice floe size distribution (FSD) is an important component for thermodynamic and dynamic processes, particularly in the marginal zone. Recently FSD-related processes have been incorporated models, but sparsity of existing observations limits evaluation FSD so hindering model improvements. In this study, three models are selected – Waves-in-Ice module Power law Floe Size Distribution (WIPoFSD) two branches a fully prognostic size-thickness model: CPOM-FSD FSDv2-WAVE. These...

Abstract. Sea ice is composed of discrete units called floes. The size these floes can determine the nature and magnitude interactions between sea ice, ocean, atmosphere including lateral melt rate, momentum heat exchange, surface moisture flux. Large-scale geophysical models employ a continuum approach traditionally either assume adopt constant or do not include an explicit treatment floe size. Observations show that range sizes spanning orders magnitude, from metres to tens kilometres. In...

An eddy covariance system and other atmospheric oceanic parameters were measured simultaneously from a fixed Platform-A in the Bohai Gulf during early mid-August 2011. One of main goals comprehensive observation was to reveal basic meteorological hydrological characteristics Gulf. The results indicated that diurnal characteristic curve for air temperature (AT) steeply unimodal, while SST bimodal valley type mainly influenced by tides with its value corresponding high water level period....

There have been several recent efforts to develop parameterisations of the sea ice floe size distribution (FSD) for use in models such as CICE and SI3. These aim capture key processes that determine evolution sizes, including melting at edges floes, welding together break-up floes by waves. However, fragmentation are not yet accounted these models. For example, in-plane brittle fracture events can a direct impact on larger potentially also smaller floes. Plausible indirect mechanisms exist....

<p>The floe size distribution (FSD) is important to the physical and biological processes in marginal ice zone (MIZ). The FSD controlled by advection, thermodynamics (lateral melting), dynamics (winds, tides, currents ocean swell). These thermodynamic dynamic conditions are different between western Arctic (e.g., Chukchi Beaufort Seas) eastern Fram Strait). For example, MIZ strongly influenced a warm due enhanced sea-ice albedo feedback, while swell. We hypothesise that this...

S1 Perimeter densityS2 Sensitivity to the floe size category binning and calculation methods densityIn this study, we use perimeter density per unit ice area (units: m -1 ) evaluate model performance, as it reduces impacts of partially captured floes at edge image for FSD retrieval (Perovich, 2002; Perovich Jones, 2014).There are a number ways calculate .In following, describe how models , well can be calculated from observational data. Calculation 𝑃 𝑖 in modelsIn models, is distributed into...

<p>The Arctic sea ice cover is not a continuous expanse of but instead composed individual floes. These floes can range in size from just few metres to tens kilometres. Floe influence variety processes, including lateral melt rates, momentum transfer within the ice-ocean-atmosphere system, surface moisture flux, and rheology. Sea models have traditionally defined floe using single parameter, if explicitly treated at all. There been several recent efforts incorporate Size...