کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8060445 | 1520442 | 2014 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dissipation measurements using temperature microstructure from an underwater glider
ترجمه فارسی عنوان
اندازه گیری های انحلال با استفاده از میکروساختار دما از یک پلاتر زیر آب
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
اقیانوس شناسی
چکیده انگلیسی
Microstructure measurements of temperature and current shear are made using an autonomous underwater glider. The glider is equipped with fast-response thermistors and airfoil shear probes, providing measurements of dissipation rate of temperature variance, Ï, and of turbulent kinetic energy, ε, respectively. Furthermore, by fitting the temperature gradient variance spectra to a theoretical model, an independent measurement of ε is obtained. Both Batchelor (εB) and Kraichnan (εK) theoretical forms are used. Shear probe measurements are reported elsewhere; here, the thermistor-derived εB and εK are compared to the shear probe results, demonstrating the possibility of dissipation measurements using gliders equipped with thermistors only. A total of 152 dive and climb profiles are used, collected during a one-week mission in the Faroe Bank Channel, sampling the turbulent dense overflow plume and the ambient water above. Measurement of ε with thermistors using a glider requires careful consideration of data quality. Data are screened for glider flight properties, measurement noise, and the quality of fits to the theoretical models. Resulting dissipation rates from the two independent methods compare well for dissipation rates below 2Ã10â7  W kgâ1. For more energetic turbulence, thermistors underestimate dissipation rates significantly, caused primarily by increased uncertainty in the time response correction. Batchelor and Kraichnan spectral models give very similar results. Concurrent measurements of ε and Ï are used to compute the dissipation flux coefficient Î (or so-called apparent mixing efficiency). A wide range of values is found, with a mode value of Îâ0.14, in agreement with previous studies. Gliders prove to be suitable platforms for ocean microstructure measurements, complementary to existing methods.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Methods in Oceanography - Volume 10, September 2014, Pages 44-69
Journal: Methods in Oceanography - Volume 10, September 2014, Pages 44-69
نویسندگان
Algot K. Peterson, Ilker Fer,