The phrase "sharp upsurge" is correct and usable in written English.
You can use it when you wish to refer to a rapid increase in a quantity. For example, "The population of the city saw a sharp upsurge over the past year."
Amtrak initially reported a sharp upsurge in ridership after the attacks, but when the final figures came out, ridership was shown to have declined 6percentt in September, and about 1percentt in October and November.
In August, a 4-year-old girl in a Jordanian border town was injured when a Syrian shell struck her house, and there are concerns in Jordan that a sharp upsurge in the fighting in Syria might lead to an even greater influx of refugees.
With Mr Assad's troops apparently determined to wipe out armed opposition in advance of the ceasefire, the Syrian National Council, an umbrella opposition group based in Istanbul, protested that the death rate had climbed to 1,000 during the first week of April, a sharp upsurge for a conflict that has claimed, on UN estimates, some 9,000 victims in a whole year.
It is envisaged that recent commercialization exercise in the power sector, in the long run should result in an improvement in power supply and a sharp upsurge in entrepreneurial and economic activity (Okwuosa & Amaeshi, 2015).
As he had already explained in a news conference on Friday, the sharp upsurge in violence over the past 10 days had limited the monitors' ability to do their job of observing, verifying and reporting developments on the ground and trying to foster dialogue.
"The continuing tension of buccal sphincters and the recessive tongue role tally with earlier studies of facial rigidity (cf., Adolf Hitler, Nixon) … Parallel films of rectal images revealed a sharp upsurge in anti-Semitic and concentration camp fantasies (cf., anal-sadistic fantasies in deprived children induced by rectal stimulation)." .
Several networks reported sharp upsurges in usage for their streaming video offering of the debates, but none offered definitive data on how many people watched online.
The upsurge in child detentions was even sharper – climbing 230% to just over 23,000, Mexican interior ministry figures reveal.
David Wild left in July after a sharp fall in sales, but analyst Nick Bubb said there were hopes the group would benefit from the Bradley Wiggins effect and the upsurge of interest in cycling after the Tour de France and Olympics.
"The upsurge has started again".
