¥The in situ data are not global and have
problems
¥Satellites drift
in orbit and instruments degrade: the data generally do not provide a climate record. They could.
¥The satellite
record is in jeopardy, especially from demanifesting several climate instruments from
NPOESS.
¥A baseline transfer standard is essential: in situ super sites
(reference radiosonde plus network).
¥Regional climate
requires attention to modes of variability and model initialization