کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6387964 1627745 2016 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modelling surface currents in the Eastern Levantine Mediterranean using surface drifters and satellite altimetry
ترجمه فارسی عنوان
مدل سازی جریانهای سطح در دریای مدیترانه دریای مدیترانه ای با استفاده از ارتعاشات سطحی و ارتفاع سنجی ماهواره ای
کلمات کلیدی
ارتفاع سنجی، داده های لاگرانژی، تسریع داده ها، رانندگان میدان سرعت سطحی، لووانتین شرقی مدیترانه،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
چکیده انگلیسی


- We present an efficient algorithm that blends drifter data and altimetry data.
- It is used to continuously improve surface velocity estimation in the East-Med.
- Assimilating a drifter datum gives correction in a radius of 20 km and a 24 h window.
- Improvement of velocity estimation is shown near the Lebanese coast.
- Accurate eddy estimation (dimension and intensity) in S.E. of Cyprus is shown.

We present a new and fast method that blends altimetric and drifter positions data in order to predict the surface velocity in the Eastern Levantine Mediterranean. The method relies on a variational assimilation approach where a velocity correction is continuously obtained by matching observed drifter positions with those predicted by a simple advection model. The background velocity used in the advection of the drifters is the aggregate of a geostrophic and a wind-driven component and the velocity correction is constrained to be divergence free. The algorithm employs a sliding time window that assimilates at once and inside each frame, an entire trajectory of drifters. We show that with few drifters, our method improves the estimation of velocity in two typical situations: an eddy between the Lebanese coast and Cyprus, and velocities along the Lebanese coast.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ocean Modelling - Volume 104, August 2016, Pages 1-14
نویسندگان
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