2,023,268 research outputs found
Jason-1/Jason-2 metocean comparisons and monitoring
Full text linkThe initial tandem phase of the Jason-2 mission is important for the calibration of the entire altimetric system, not just the records of sea surface height. However, as well as allowing a bulk comparison of metocean parameters such as wave height and backscatter strength (used to infer wind speed), it affords a more detailed opportunity to understand the artefacts within each instrument. The wave height comparison shows no bias between the instruments, with the mismatch error of consecutive points independent of one another. The backscatter difference is not a simple offset, but has a trend with weak non-linear variations. The technique for backscatter monitoring using Ku-/C-band differences is validated during the tandem phase, and extended to show ~59-day oscillations throughout the Jason-1 mission. This effect, which is predominantly in the C-band, is related to changing solar exposure, due to the fraction of orbit in eclipse varying as the orbit precesses. Such anomalies were partially present in TOPEX-B data, but are not noticeable for Jason-2. It is recommended that all TOPEX, Jason-1 and Jason-2 data be transformed to a consistent scale, allowing for the bias and trend terms in the offsets between instruments, and correcting for any long-period drifts in individual calibration; this will enable a single wind speed algorithm to be applied to the combined satellite data
Letter from Howard Jason to William C. Jason
No full textA letter from Howard Jason to William C. Jason writing about his travels in Puerto Rico and the storm
Extending Genetic Criticism to Audiotexts: A Conversation with Jason Wiens
Full text linkJason Lee Wiens, a CanLit scholar, has been involved in the SpokenWeb Pedagogy Task Force, developing approaches to teaching with sound recordings, over the past year. Wiens’ engagement in the use of sound recordings in the teaching of Canadian poetry has led him to think about the relationship between sound recordings of author’s reading their works (sometimes in advance of their publication) and the published versions of those same poems. The following discussion explores and extends some of the thinking developed for Wiens' paper “Sounding Difference: Genetic Criticism and Literary Audio Recordings,” delivered at at the “Genesis – Genetic Criticism: from Theory to Practice” conference held at the Jagiellonian University (Kracow), and co-sponsored by the Institute des Textes et Manuscrits Modernes (Paris), 12-14 June 2019
Letter from Howard Jason to William C. Jason
No full textA letter from Howard Jason to William C. Jason writing about his travels in Puerto Rico and the storm
Correspondence to Reverend William C. Jason from H. T. Jason
No full textA letter letting Reverend William C. Jason know that H. T. Jason will pay back the money that he borrowed
Correspondence to Reverend William C. Jason from H. T. Jason
No full textA letter letting Reverend William C. Jason know that H. T. Jason will pay back the money that he borrowed
Improving the intercalibration of ?0 values for the Jason-1 and Jason-2 altimeters
Full text linkThe normalized backscatter from a radar altimeter, ?0, is a measure of the surface roughness at scales of a few
radar wavelengths; over the ocean this is used to infer wind speed. Long-term studies of wind speed rely on consistent
measurements within an altimetric mission and good intercalibration between missions. For the Jason-1 and Jason-2
altimeters the derivation of ?0 from the full waveform data is known to be sensitive to the recovered value for ?2, a
term encompassing both mispointing and inhomogeneities within the altimetric footprint. The six months of data from
the Jason-1/2 tandem mission reveal that different ?0 corrections are needed for these two causes of non-zero ?2
values. With these corrections implemented, the r.m.s. difference of Ku-band ?0 values for Jason-1 and Jason-2 drops
from 0.15 dB to 0.05 dB, with the bias between the two showing a clear trend with wind speed; Jason-1 being 0.04 dB
greater in high winds but 0.19 dB greater in low winds. No clear change in offset is noted during the 6 months of
overlapping data. Implementation of this correction will improve consistency of Jason-1 ?0 values and may impact on
orbit-fitting procedures
Correspondence to Reverend William C. Jason from Madora Bailey Jason
No full textA letter from Madora Bailey Jason to Reverend William C. Jason about a letter Madora received and attached from Mrs. Lydia Moore about the concern of William seeing their children
Correspondence to Reverend William C. Jason from Madora Bailey Jason
No full textA letter to make arrangements for Reverend William C. Jason to see the kids and stay with them while Jason is at Conference and to catch William up to date with Madora's daily life
Correspondence to Reverend William C. Jason from Madora Bailey Jason
No full textA letter to make arrangements for Reverend William C. Jason to see the kids and stay with them while Jason is at Conference and to catch William up to date with Madora's daily life
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