Unit:
Κατεύθυνση Φυσική Περιβάλλοντος (ΕΦΑΡΜΟΣΜΕΝΗ ΦΥΣΙΚΗ)Library of the School of Science
Supervisors info:
Μ. Τόμπρου Αναπλ. Καθηγήτρια ΕΚΠΑ (επιβλέπουσα), Β. Αμοιρίδης Εντεταλμένος Ερευνητής Εθνικού Αστεροσκοπείου Αθηνών, Κ. Καρτάλης Αναπλ. Καθηγητής ΕΚΠΑ
Original Title:
Προσδιορισμός ύψους ανάμειξης από δορυφορικά δεδομένα CALIPSO και σύγκρισή τους με αριθμητικές προσομοιώσεις. Πειραματική εκστρατεία ACEMED
Translated title:
Comparison of mixing layer heights derived from CALIPSO satellite data and numerical simulations from WRF model. Experimental campaign ACEMED
Summary:
This study aims at the derivation of the mixing height (MH) from CALIPSO
space-borne lidar observations and their comparison with simulations of the
Planetary Boundary Layer (PBL) height by WRF model. The geographical area of
the application is Greece (34W–43E, 18N–29N) and the selected time period
coincides with the conduction of the experimental campaigns AEGEAN-GAME and
ACEMED (28/2/2011 - 9/9/2011). 1883 CALIPSO aerosol/cloud vertical
distributions were examined in total, both over land (1010 cases) and ocean
(873 cases). Four (4) algorithms were developed for the derivation of MH from
CALIPSO observations based on three (3) well-known methodologies proposed in
the literature (first layer, standard deviation method, first derivative
method) and one methodology that for the first time is proposed here, which is
based on the first derivative method and thresholds related to the aerosol load
of the area under study. The scatter diagrams between CALIPSO retrievals and
WRF estimations indicate relatively good comparisons for the first derivative
and the aerosol-load-constrained method. The first derivative method shows
better performance in relation to WRF for daytime MH retrievals over land
(unstable conditions). The aerosol-load-constrained method shows better
performance in relation to WRF for nighttime MH retrievals over land and ocean
(stable conditions). PBL estimates from WRF found to vary between 300 to 600 m
lower than CALIPSO MH retrievals for unstable conditions, while for stable
conditions the WRF underestimation found to vary between 100 and 300 m.
Keywords:
CALIPSO, Mixing layer height, WRF model
