OVERVIEWSea level is one of the most useful oceanographic parameters. Sea level data are vital to scientists for studies of fluctuations in major ocean currents and global climate change, to engineers for the design of coastal installations, to a large community engaged in what is now called "operational oceanography" (e.g. the provision of flood warnings from storm surges and tsunamis), and in local applications such as provision of tide tables and real-time data for port operations. For nearly 25 years, the Global Sea Level Observing System (GLOSS) has provided oversight for the operation of tide gauge networks and has ensured that requirements for accuracy, frequency and latency of sea level data are met for a broad base of users. After a brief background of the program, we present a status report of GLOSS in 2009, and provide community recommendations for the future role of GLOSS in the coming decade.
P r e l i m i n a r y r e s u l t s o f an intercomparison between several wave measurement systems used d u r i n g t h e ARSLOE experiment. are presented.The comparison c o n s i s t s o f some o f t h e measurements i n t h e o f f s h o r e r e g i o n , 12 km t o 40 km offshore, taken d u r i n g a storm that occurred October 23 t o 26, 15180. The r e s u l t s i n d i c a t e t h a t d i f f e r e n c e s i n s i g n i f i c a n t wave heights can be larger than the random v a r i a b i l i t y . Waves Program (CWP) of the National Ocean Survey, National Oceanic and Atmospheric Administration jointly hosted the A t l a n t i c Remote Sensing Land-Ocean Experiment (ARSLOE). P a r t i c i p a t i o n i n t h e e x p e r i m e n t was b r o a d w i t h i n v e s t i g a t o r s f r o m Government agencies, foreign countries, industry, avd academic i n s t i t u t i o n s u s i n g v a r i o u s s u r f a c e , s u b s u r f a c e , and remote sensing wave measurement systems. One of the purposes of the experiment was t o t e s t and compare a v a i l a b l e wave measurement systems. ARSLOE i n c l u d e d a c o n f i g u r a t i o n o f wave measurement systems that covered a 40 km x 40 km r e g i o n o f f t h e c o a s t o f Duck, North Carolina. This intercomparison concentrates on some of t h e measurements i n t h e o f f s h o r e r e g i o n t a k e n d u r i n g a 4-day period from October 23 t o 26, 1980, when a major storm passed through the site area. The storm was o f i n t e r e s t s i n c e i t c o n s i s t e d o f a complex f r o n t a l system which resulted i n opposing seas. Table 1 e n t t h e a p p r o x i m a t e l o c a t i o n o f t h e c e n t e r f o r t h e f l i o h t p a t h s . Most buoy measurements a r e e i t h e r a t 12 o r 36 km o f f s h o r e . There are some d i f f i c u l t i e s and l i m i t a t i o n s when comparing d i f f e r e n t i n s t r u m e n t a t i o n i n s i t u .Tt. would he i d e a l t o have t h e measurement systems i d e n t i c a l l y l o c a t e d so any d i f f e r e n c e f o u n d c o u l d b e r e l a t e d o n l y t o t h e measurement systems.S i n c e t h i s i s n o t p o s s i b l e , a l l o w a n c e must he made f o r d i f f e r e n c e s due t o n a t u r a l v a r i a b i l i t y between deployment locations. S i m i l a r l y , d i f f e r e n c e s s h o u l d be expected when comparing a buoy t h a t measures a t a p o i n t l o c a t i o n w i t h a radar system which measures over some f i n i t e area, There are other differences due t o t h e dynamics o f d i f f e r e n t m o o r i n g s , varying sample lengths, and v a r y i n g a n a l y s i s methods, such as t h e window used when computing spectra. Therefore, when i n t e r p r e t i n g t h e r e s u l t s , i t i s i m p o r t a n t t o c c n s i d e r t h e s e l i m i t a t i o n s . Three Waveriders were deployed i n a l i n e p a r P l l e l t o s h o r e a t t h e 12 km s i t e w i t h t h e 2 outermost ones positioned 1 km apart. A l l three instruments w...
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