Growing uncertainty in projected spring onset variability in the
Northern Hemisphere
Xiaolu Li[1], Toby Ault[1],
Colin P. Evans[1], Flavio
Lehner[1,2], Carlos M.
Carrillo[1], Alison
Donnelly[3], Theresa
Crimmins[4], Amanda S.
Gallinat[3], Mark D.
Schwartz[3]